Regex for only alphanumeric characters. Sep 7, 2010 · I’m not familiar with ASP.

Regex for only alphanumeric characters Mar 11, 2013 · To enforce three alphabet characters anywhere, /(. I don't want that to happen. regex101: regex for allowing only certain special characters and also including the alphanumerical characters Mar 2, 2024 · In this article I will explain with an example, how to use Regular Expression (Regex) to accept/allow only Alphanumeric characters i. Thus, we will not consider any special characters or underscores as part of Alphanumeric characters. PHP Alphanumeric Regular Expression. These are the only Types allowed in the string. +,/\"]*$". To match a literal ^ just put it into any position but the first. You can specify a range of characters by using a hyphen, but if the hyphen appears as the first or last character enclosed in the square brackets, it is taken as a literal hyphen to be included in the character class as a normal character. Jan 25, 2021 · Hi , I am trying for regex that should take only AlphaNumeric as first character but when i go with [A-za-z0-9], it is also taking white space as valid, how to avoid space as first character in regex C#. I am assuming that by "alphabet" you mean A-Z. The /s _italic_means ANY ONE space/non-space character. Your first two requirements ("Allows only alphanumeric characters" and "Allows only special characters defined in the Regex") are clearly at odds: a string that contains only alphanumeric characters cannot contain any special characters. The regexp you need is really is: ^[a-zA-Z0-9]{4,10}$ This says: It starts with alphanumeric. This is for use with a JavaScript function. Nov 11, 2014 · I've been struggling to figure out how to best do this regular expression. Oct 8, 2021 · You can use anchors, and make sure to match a single digit. Note that a few characters need escaping inside a character class otherwise they have a special meaning in the regular expression. By the way, as per Wikipedia, for the first character, vowels are not used. Nov 15, 2008 · \w is any 'word' character - depending on regex flavour it might be just [a-z0-9_] or it might include others (e. inside Jan 9, 2012 · My only comment is that, depending on the Regex engine being used, certain special characters don't need to be escaped. Oct 4, 2019 · I'm trying to find the regular expression to find just the alphanumeric words from a string i. The ^ means italic NOT ONE of the character contained between the brackets. If the pattern matches the string is validated. Aug 16, 2017 · You seem to need to avoid matching strings that only consist of digits and make sure the strings start with an alphanumeric. Apr 16, 2014 · If that's really what you want to know (if there is anything other than those characters), then you can reverse the character class like this, and remove the ^, *, and $: [^a-zA-Z0-9,. '/ May 22, 2014 · I have made an expression that validates for alphanumeric characters. Invalid: 4foo (start with a number) foo bar (contains a space) foo$@bar (contains special character) Valid: foo; foo_bar; Foo_Bar Oct 20, 2012 · [] returns true if any of the characters / range specified is matched; Ranges are defined in this case (yes, re is smart enough to differentiate ranges from chars). The text begin with any letter and could have space in between only. matches a period rather than a range of I'm trying to get a regular expression that allows between 6 - 15 characters and can be a-zA-Z0-9 and the symbols above the numbers 1-8 on a keyboard. select regexp_substr('Save up to 10% on National Brands and 20% on Quill Brand Laser Toner','[[:alnum:]]+') string from dual; Character classes. sub(regular_expression, '', old_string) re substring is an alternative to the replace command but the key here is the regular expression. regex101: regex for allowing only certain special characters and also including the alphanumerical characters Jun 3, 2016 · I'm trying to select all rows that contain only alphanumeric characters in MySQL using: SELECT * FROM table WHERE column REGEXP '[A-Za-z0-9]'; However, it's returning all rows, regardless of the fact that they contain non-alphanumeric characters. (dash) (underscore) (period) ( Space) & $ # Numeric; Albhapet; For this i have a regex that i came up with,with the help of some articles online. >>> matches = re. You can see the example in this image: Mar 26, 2010 · I would consider this for a valid username: 1) Username must be 6-30 characters long 2) Username may only contain: Uppercase and lowercase letters; Numbers from 0-9 and ; Special characters _ - . The field should only allow alphanumeric characters, dashes and underscores and should NOT allow spaces. So below test cases should pass. Alphabets (Upper and Lower case) and Numbers (Digits) in Windows Forms (WinForms) Application using C# and VB. accented chars/etc). I'm using PCRE2. I just discovered yet another beautiful (or horrible) PCRE2 feature: Non-atomic lookaround assertions. Sep 7, 2010 · I’m not familiar with ASP. Or even simpler [a-zA-Z] or [a-z] The last if you can set the case insensitive flag (you haven't stated regex flavor). the given code return me the correct match but if i add another kind of the special character like @% then the correct result i got, but i want the incorrect result. The first five characters sh Jun 25, 2009 · Regular expression for allowing a user to enter alphanumeric characters and only one non-alphanumeric character 4 Regex to validate length of alphanumeric string I have requirement to allow alphanumeric and certain other characters for a field. Jan 3, 2023 · Given string str, the task is to check whether the string is alphanumeric or not by using Regular Expression. Have more than one sequential character _ - . I don't have Apr 2, 2014 · I am trying to do the following with regex Only A-Z and 0-9 Not one character in its own Can not be just numbers on their own Can be just letters on their own but at least 2 characters I have Jan 20, 2021 · Use a character set: [a-zA-Z] matches one letter from A–Z in lowercase and uppercase. Create another set [_\s-]* for special characters, "*" quantifier is to validate that there can be special characters within comparer string. Feb 19, 2016 · ValidatePattern supports regex. Jan 20, 2009 · This also allows just one character as a match. Other "special" characters you need do not have to be escaped in the character class. To match a -literally, don't put it between characters (i. NET, Rust. Apr 23, 2013 · The regex below is the only one worked for me: "\\p{LD}+" ==> LD means any letter or digit. This regex fulfils a) and b). Jan 23, 2022 · import re regular_expression = r'[^a-zA-Z0-9\s]' new_string = re. I need to validate an input so that it matches only these criteria: Letters A-Z (upp Mar 13, 2017 · How can I match an alpha character with a regular expression. @&,’()+/:]*$ I need to add a single hyphen to this list, not allowing multiple hyphens, but I'm not quite sure how to do it. Jun 1, 2010 · I am trying to create a regular expression in C# that allows only alphanumeric characters and spaces. Removing non-alphanumeric chars. But it accepts inputs with only apostrophe and space also(e. Alphanumeric characters are a combination of letters and numbers. If you want to check value only contains those characters, there's no need to create another string: Jan 10, 2015 · I want extract just alphanumeric character from the string below. 3) Username may not: Begin or finish with characters _ - . pattern = "^[a-zA-Z0-9 ,:/\\-]*$" Mar 26, 2012 · You can use String. sub(r'\W+', '', 'This is a sentence, and here are non-english 托利 苏 !!11') I want to get as output: > 'This is a sentence and here are non-english 11' Apr 8, 2015 · @zygimantus Not this expression, no - since the total length could be split in multiple ways across the two(/three) parts of this expression. Accept - in between but cannot end with - Jan 5, 2019 · [Edited thanks to Khabz's comment. For a match only, you can omit the capture group: ^[^\W\d]*\d\w*$ ^ Start of string [^\W\d]* Optionally match any word character except a digit \d Match a single digit \w* Match optional word characters $ End of string; Regex demo. Also causes escape sequences to match unicode characters; Note, that if the hyphen is the last character in the class definition it does not need to be escaped. Oct 9, 2023 · First, let’s identify the term explicitly to avoid any confusion. sub(r'\W+', '', s) Although, it still keeps non-English characters. If you want to check if any of the characters is non-alphanumeric, then you need to use re. c. May 29, 2023 · Regex which allows alphanumeric character and only single "-" Hot Network Questions Computing the “real width” of a horizontal or vertical list Oct 12, 2023 · Regular Expression for JavaScript to Allow Only Alphanumeric Characters. Only A-Z and 0-9; Not one character in its own; Can not be just numbers on their own; Regular Expression only allow alphanumeric plus other specific characters. This is my regular expression for alphanumeric validation only: var numericReg = /^([a-zA-Z0-9]){1,20}$/; To which, I need to include hyphen and space too. Sep 8, 2021 · One alphabetic ASCII character; Zero or more alphanumeric ASCII characters. Bergi, you have a point, but I'd rather always escape any characters which could be interpreted as a special character, even if inside a []-block they wouldn't, so people not too familiar with Regexes don't have to think about whether it means something special or not. If you need other characters you can add them. Example regex: a. [[a-zA-Z0 Apr 12, 2022 · The TRE compliant regex matches [^ - start of a negated bracket expression: a-z - lowercase ASCII letters; A-Z - uppercase ASCII letters; 0-9 - ASCII digits [:space:] - a POSIX character class matching any whitespace] - end of the bracket expression. Regex for alphanumeric and special characters in Apr 30, 2013 · FYI, restricting the allowed characters for a password reduce the entropy a lot (there are only 36 different characters now) and hence makes them much easier to crack. Besides hyphens and shorthands, only backslashes \\ and closing brackets \] need to be escaped. . replaceAll("[^A-Za-z]+", ""); // newstr will become WordWord Edit: Although OP hasn't mentioned anything about unicode characters but since @Joey has made a comment and if at all there a requirement to keep unicode Here is a regex string I need to use but I only want it to match exactly 16 alphanumeric characters not the 16 within a longer string. Jun 21, 2018 · And the input should be minimum 1 character and maximum 24 characters. 1. However, the string does not have to contain all of the specified arguments. Feb 3, 2010 · Pass it through multiple regexes if you can. When you place the -hyphen at the start or end of the character class, or right after a POSIX character class, it is treated as a literal hyphen. @ridgerunner has a neat solution, but if the end of the string is an special character it won't match. " ' ' "). Jul 10, 2014 · Right now my regex is something like this: [a-zA-Z0-9] but it does not include accented characters like I would want to. The key to this is the \d* at the front. Pass. I assume you also need to be able to match empty strings (the original regex matches empty strings). Here are my requirements: Up to 8 characters; Can only be alphanumeric; Can only contain up to three alpha characters [a-z] (zero alpha characters are valid to) Any ideas would be appreciated. End of expression. Word boundaries, multi-line support, etc Jan 21, 2016 · As per your requirement of including space, hyphen, underscore and alphanumeric characters you can use \w shorthand character set for [a-zA-Z0-9_]. \s_-]+$ ^ asserts that the regular expression must match at the beginning of the subject [] is a character class - any character that matches inside this expression is allowed; A-Z allows a range of uppercase characters; a-z allows a range of lowercase characters. So, [^0-9a-zA-Z]+ returns sub-strings containing characters not in 0-9, a-z, A-Z range. ,!"'/$). The valid PAN Card number must satisfy the following conditions: It should be ten characters long. Examples: Input: str = "GeeksforGeeks123" Output: true Explanation: This string conta Jan 3, 2023 · Given string str of alphanumeric characters, the task is to check whether the string is a valid PAN (Permanent Account Number) Card number or not by using Regular Expression. IsDigit, IsXXX methods to filter out unwanted characters. (You can add a range of characters by using a -dash. Feb 6, 2016 · I would like to have a regular expression that checks if a string contains only alphanumeric and hyphen. var regex = new RegExp("^[a-zA-Z0-9]+$"); I also want to restrict the input to only 8 characters in same expression. [A-Z]{6}[0-9]{2}[A-E,H,L,M,P,R-T][0-9]{2}[A-Z0-9]{5} Its matches this: PLDTLL47S04L424T and MRTMTT25D09F205Z perfectly But what i dont want it to match is something like this in bold thats in middle of this long Mar 3, 2017 · Python regex only matching a single "/" after alphanumeric characters. Alphanumeric … Oct 12, 2023 · Regular Expression for JavaScript to Allow Only Alphanumeric Characters. To negate the space and hyphen at the beginning and end I have used [^\s\-]. ]. *[a-zA-Z]. I have used below query but it doesn't seems to be working as expected. Use \w to match any single alphanumeric character: 0-9, a-z, A-Z, and _ (underscore). If you must ensure that no non-letter characters are matched, anchor the regex like ^[^A-Za-z]+$-- I think that's what you are asking. [a-zA-Z]+ matches one or more letters and ^[a-zA-Z]+$ matches only strings that consist of one or more letters only (^ and $ mark the begin and end of a string respectively). Checking Approaches Oct 16, 2018 · Add the characters you want within the [ ] square brackets. You put the quantity limiter outside it (you previously had + which is 1 or more - replace it with {0, 40} which is between 0 and 40). Related. Jan 8, 2020 · If you need to include non-ASCII alphabetic characters, and if your regex flavor supports Unicode, then \A\pL+\z would be the correct regex. / + , “ But when I test the pattern with a string "test_for_extended_alphanumeric" , the string passes the test. Jun 4, 2021 · Event names can be up to 40 characters long, may only contain alphanumeric characters and underscores ("_"), and must start with an alphabetic character. NET's balancing groups. For example, some engines don't need - to be escaped if they're used just after a range because the engine can figure out that the 2nd - couldn't be part of another range. Mar 17, 2014 · How do I remove all non alphanumeric characters from a string except dash? 923 Regex for password must contain at least eight characters, at least one number and both lower and uppercase letters and special characters To create a regular expression that allows only alphanumeric characters, we can use the regex pattern ^[a-zA-Z0-9]+$. e the words that are a combination of alphabets or numbers. e. ( I need special character only for the middle name) So I tried following regular Jan 10, 2019 · Only replaces those characters if they're the only ones in the string, because of the anchors (^ and $). I want a character that is in \\w but is not in \\d. The problem here is that if I enter only numeric character like "897687", then the regex still matches. 12fUgdf, dGgs1s23 are some valid inputs. {6,50} means between 6 and 50 (inclusive) \b means word boundary (ensuring the word does not exceed the 50 at either end). Remember in java, you always need to use double backslashes (one is interpreted by java, the other by the regex engine). \* \\ escaped special characters \t \n \r: tab, linefeed, carriage Alphanumeric Regular Expression. Pattern strings are treated as UTF-16. abc // match a c // match azc // match ac // no match abbc // no match Match any specific character in a set. replace(/\W/g, '') Note that \W is the equivalent of [^0-9a-zA-Z_] - it includes the underscore character. , at the start or at the end). May 17, 2012 · @minitech, true, thanks for the clarification. Now there must be at least 4 alphas. Here's what I have but it doesn't work. You could do it more easily with the accepted answer (replace the + with e. But it didnt workout. Regular Expression To Match Only Alphabets And Spaces; Characters & constructs: A regular expression to parse and validate Dec 7, 2011 · the special character i want that is ][#-. g. May 26, 2009 · Use a regex to filter out the other characters. -]+$/ following strings are also accepted: tavish. I want it unicode compatible that's why I cannot use [a-zA-Z]. Is there a way? Well also yes. There should not be any spaces or other special characters other these three. length() < 80) before Jul 2, 2022 · Use the dot. And I have exactly the same requirement. Escape the hyphen using \-as it usually used for character range inside character set. ]/'. any character except newline \w \d \s: word, digit, whitespace \W \D \S: not word, digit, whitespace [abc] any of a, b, or c [^abc] not a, b, or c [a-g] character between a & g: Anchors ^abc$ start / end of the string \b: word boundary: Escaped characters \. My string will be under either of these 2 patterns. There can be a minimum of 4 and a maximum of 10 alphanumeric. For example if I have. Test Test'My Regex Test' 123' Regex ' Fail '' Aug 29, 2011 · I need a regular expression to match strings that have letters, numbers, spaces and some simple punctuation (. {1,80} for a line less than 80 chars); but that said regex is a poor tool for validating length, and if possible I'd just check it directly (e. Otherwise (if you want to know if the string has any of those characters), you should just remove everything but the character class: '/[a-zA-Z0-9,. It does not enforce that the string contain only non-letters. Also I escaped your -character in your character class, or else it will be interpreted as a range. More specifically, Latin letters and Arabic digits. This pattern ensures that the string consists solely of uppercase alphabets, lowercase alphabets, and digits. 3. An alphanumeric string is a string that contains only alphabets from a-z, A-Z and some numbers from 0-9. Not every regex flavor knows these POSIX classes, use the traditional form if you like. More Aug 2, 2021 · I'm looking for a regex with at the conditions: a) minimum 13 alphanumeric characters; b) maximum 17 alphanumeric characters; c) and at least 1 digit. I’m expecting to accept apostrophe and space only with some alphanumeric characters. Edit. Oct 8, 2008 · Create a set using [a-zA-Z0-9]+ for alphanumeric characters, "+" sign (a quantifier) at the end of the set will make sure that there will be at least one alphanumeric character within the comparer. My regex This regex appears to be designed to match a string that consists of alphanumeric characters, underscores, and an optional leading hyphen. letters A–Z, a–z, and digits 0–9. Ah, you'ved edited your question to say the three alphabet characters must be consecutive. I hope it help . @Marcus The pattern looks for any character other than upper/lower letters, and your single whitespace matches. Regex. Sep 11, 2010 · Add your own special characters as appropriate for your needs. The anchored pattern should not match Can only contain alphanumeric characters, and hyphens; all other characters are not allowed (including an underscore, which means I can't use the \W regex symbol) I've solved the first two in the list, but I'm having trouble figuring out how to check if a bash string contains only letters, digits, and hyphens. Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. Without it the regex gets much more awkward to do. It is not so readable, though. Lots of ways to do this. Need Alphanumeric Regex. May 6, 2022 · However, despite the [a-z0-9] part of the regex, it also keeps selecting myCol values containing special characters like 00-d@!b8-d6/f&#b. Example: 121232, abchfe, abd()*, 42232^5$ are some example of invalid input. If a word is pure numbers or pure characters I need to discard it. Use square brackets [] to match any characters in a set. It'll be a lot cleaner than those look-ahead monstrosities :-) ^[a-zA-Z0-9]{6,10}$ [a-zA-Z] [0-9] Though some might consider it clever, it's not necessary to do everything with a single regex (or even with any regex, sometimes - just witness the people who want a regex to detect numbers between 75 and 4093). replaceAll(regex, replacement) with the regex [^A-Za-z]+ like this: String newstr = "Word#$#$% Word 1234". I'm a newbie to RegEx, and this particular issue is flummoxing me. please help. character as a wildcard to match any single character. replaceAll("\\P{LD}+", "");//Note P is capital. ), apostrophe ('), and space. below are some valid and… Oct 19, 2015 · They're escaped in other languages where you use them as pattern delimiters. Alphanumeric characters are all the alphabets and numbers, i. ): // alphanumeric static final validCharacters = RegExp(r'^[a-zA-Z0-9]+$'); The regex above matches upper and lowercase letters and numbers. Dec 2, 2018 · Because Prajeesh only wants to match spaces, \s will not suffice as it matches all whitespace characters including line breaks and tabs. If the dash appears elsewhere in the class definition it needs to be escaped, as it will be seen as a range character rather then a hyphen. Jul 5, 2011 · It is pretty similar to @SLaks'; the difference is that my code works if you have alpha characters enclosed in special characters like <script>. But with the regex /^[a-zA-Z '. In regex, alphanumeric characters are typically treated as a single unit, allowing us to match or manipulate them as needed. Apr 29, 2019 · I have this line to remove all non-alphanumeric characters except spaces. You are not validating all characters in the string just one! Changing the regex pattern to match the entire string would be one approach. So, it matches any char other than the chars belonging to the ranges/POSIX character class Apr 4, 2013 · @amal. ' period character. The allowed special characters are! @ # $ & ( ) - ‘ . Nov 2, 2016 · I have the following regex ^[a-zA-Z0-9]+$ which would allow alpha numeric characters. The following is the/a correct regex to strip non-alphanumeric chars from an input string: input. The syntax for RegEx is given below. Jan 27, 2016 · However, it is not necessary. Other regex will also suffice. It can be used for various purposes, such as: Validating usernames or identifiers that allow alphanumeric characters and underscores. Checking if a string contains only alphanumeric characters and underscores. Currently, I am trying the following: string pattern = @"^\\w+$"; Regex regex = new Regex(patte Jun 1, 2017 · If you simply want to make sure the string contains a character, just match with. * if you need to match the full line. re. EBCDIC, where there is a gap between i and j, and another between r and s (which includes the ~ character), and between I and J and between R and S. That is why I suggest ^(?!\d+$)(?:[a-zA-Z0-9][a-zA-Z0-9 @&$]*)?$ See the regex demo. ;-) Note that [[:alnum:]] is a shorthand predefined character class equivalent to [a-zA-Z0-9], being more efficient, but otherwise interchangeable. However, the code below allows spaces. Don't do this restriction. This is what I've got so far, but it only looks for contiguous letter characters: there must be a '. Try a few tests and you'll see this'll pass any alphanumeric ASCII string where at least one non-numeric ASCII character is required. "^" denotes the beginning of the line and "$" denotes end of the line. Jul 1, 2016 · I want a regex for alphanumeric characters in angularJS, I've tried some regex like "(\d[a-z])" but they allow me to enter only number as well as only alphabets. You will use the given regular expression to validate user input to allow only alphanumeric characters. XYZ0123_123456; ABCdefGHI-727; I have already tried this expression. But the regular expression should look like this: ^[a-zA-Z0-9]{6,}$ ^ and $ denote the begin and end of the string respectively; [a-zA-Z0-9] describes one single alphanumeric character and {6,} allows six or more repetitions. That means, value "100-C09D10 A" must also be possible to enter. How can it fulfil also condition c)? ^[a-zA-Z0-9]{13,17}$ Example input texts: These are the special characters, numbers and alphabets that i need to check if user inputs if the user does not input as per below criteria throw an alert message . I misunderstood the question] Depending on your intention, you could also "split" instead of "match". When working with alphanumeric characters in regex, developers can leverage character classes like \w to represent any alphanumeric Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/. Alphanumeric characters are all alphabets and numbers i. So, use Mar 2, 2018 · I got a reference from the link: Javascript validation to allow only Alpha characters, hyphen (-), dot (. Meaning that the string could be alphanumeric or alphanumeric Everything in a character class [] will only match one character. but I think you will have to modify them as per your need. Nov 17, 2016 · I would like to have a regular expression that checks if the string contains Alphanumerics, Hyphen and Underscore. *[a-z]){3}/i should be sufficient. For example, the next regex also matches Dec 1, 2017 · The regex you're looking for is ^[A-Za-z. Jan 4, 2011 · What is a regular expression that accepts only characters ranging from a to z? The regular expression [a-zA-Z] will return incorrect values for some character encodings (e. 2. Details ^ - start of string Mar 12, 2015 · Note: this RegEx will give you a match, only if the entire string is full of non-alphanumeric characters. Below is my select query: SELECT * from Table WHERE myCol LIKE '[0][a-z0-9]%' AND LEN(myCol) = 16 How should the expression be changed to select only rows with myCol values that don't contain special characters? Nov 5, 2012 · Ensure that a string only contains (ASCII) alphanumeric characters, underscores and spaces ^[\w ]+$ Only Alphabets no space or _ ^[a-zA-Z]+$ To match a string that contains only those characters (or an empty string), try ^[a-zA-Z0-9_]*$ Some patterns that may help . A character set that should universally work across all RegEx parsers is: [a-zA-Z0-9 ] Further control depends on your needs. Some regex engines don't support this Unicode syntax but allow the \w alphanumeric shorthand to also match non-ASCII characters. Net. search and drop the + and $ , like this I want to use a regex to limit the characters allowed. line. returns true if one or more characters match string; Finally, the ^ is the not. 0. , letters A–Z, a–z, and digits 0–9. Dec 28, 2011 · JavaScript RegEx to allow only AlphaNumeric Characters and some special characters 2 Regex which accepts alphanumerics only, except for one hyphen in the middle. NET. ie: /regex/i. Mar 15, 2010 · Dollar sign at the end of the regex (called an anchor) signifies end of string: ^([A-Z0-9]{6})\d$ I also added "^" at the start which signifies start of string and prevents matching xB3KMJP4 I also simplified the original regex. Sep 5, 2011 · In a character class, only [, ], \, -and ^ have special meaning, the ^ even only when it is the first character and the -only if it is between characters. Also, ' should be doubled in a single quoted string literal. Oct 28, 2024 · Characters Meaning [xyz] [a-c] Character class: Matches any one of the enclosed characters. May 2, 2017 · I would like to have a regular expression that checks if a string contains upper and lowercase letters, numbers, and underscores as well as a character limit. split(r Dec 29, 2015 · This is a sequel to my previous answer that makes use of . This code will match your requirement. Note that \w can also match _ Sep 26, 2013 · I have a regex for matching letters, numbers and some special characters as follows: ^[A-za-z0-9 . Alphanumeric characters refer to a combination of letters (A-Z, a-z) and numbers (0-9). That is: a - z /* a to z */ A - Z /* A to Z */ 0 - 9 /* 0 to 9 */ _ - /* underscore & dash */ ~ ! @ # $% ^ &amp Mar 11, 2012 · The -character is only allowed if it is not followed up by another -to the end of the string RegEx for allowing alphanumeric at the starting and hyphen thereafter. I would also like - ' , to be included. Or use Char. that at least one alphanumeric character Nov 4, 2014 · I need help to write a regular expression for the following strings: Ranges entered must be separated by a comma + space Can take alphanumeric character. Only letter and space in between will be allow, no number. Mar 1, 2010 · Easy, just add those characters to the regular expression as well Regex only allow alphanumeric and at least two characters. But I want a regex which won't allow me to enter them. i don't know where i did wrong please help me to make right. Trying to check input against a regular expression. I am using this regular expression: "^[a-zA-Z0-9!@#$&()-`. There should be at least one text character and it should start with a text character. Note that in some other countries there are also other characters that are considered letters. If you want to clean your text from any non alphanumeric characters you can use the following: text. qkcr ewode efv jaoezh ayfcxl cbxab mblikcb pwjpi fzrlgl wmbb