RegEx for matching "A-Z, a-z, 0-9, _" and "." - Stack Overflow
May 14, 2019 · I need a regex which will allow only A-Z, a-z, 0-9, the _ character, and dot (.) in the input. I tried: [A-Za-z0-9_.] But, it did not work. How can I fix it?
regex101: ^[a-zA-Z0-9\\._-]+@[a-zA-Z0-9-]{2,}[.][a-zA-Z]{2,4}$
[a-zA-Z0-9\._- [. Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.
Regular expression syntax cheat sheet - JavaScript | MDN
Oct 28, 2024 · For example, [\w-] is the same as [A-Za-z0-9_-]. They both match the "b" in "brisket", the "c" in "chop", and the "n" in "non-profit". Negated character class: Matches …
re — Regular expression operations — Python 3.13.5 …
1 day ago · Matches characters considered alphanumeric in the ASCII character set; this is equivalent to [a-zA-Z0-9_]. If the LOCALE flag is used, matches characters considered …
Regex Cheat Sheet
Jan 5, 2025 · Here's a quick regular expressions cheat sheet with examples to get started: .: Matches any character except newline. Example: a.c matches abc, adc. \w: Matches a word …
Free Online Regular Expression Tester - FreeFormatter.com
This free regular expression tester lets you test your regular expressions against any entry of your choice and clearly highlights all matches. It is JavaScript based and uses XRegExp library for …
Regular Expressions from [a-zA-Z] | by Siddharth | Medium
Aug 28, 2023 · Regular expression (regex) is a sequence of characters used for pattern matching and string manipulation. They provide a concise way to describe complex text patterns, …
Common Regular Expressions - CPP
Validates the format, type, and length of the supplied input field. The input must consist of 3 numeric characters followed by a dash, then 2 numeric characters followed by a dash, and …
What does this REGEX means? [a-zA-Z]|\d - Stack Overflow
May 15, 2011 · \d is a digit character. Your code means "any alphabetic or numeric character". It could more easily be expressed as [A-Za-z0-9]. @ShirazITCo, \d can match far more than 0-9. …
regex101: build, test, and debug regex
Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.