Regex TesterDev

Test and debug regular expressions in real-time with multiple matching modes.

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About Regex Tester

🎯 Overview

Regular expressions are powerful text pattern matching tools widely used in data validation, text search, and content extraction. This tool provides a real-time regex testing environment to help developers quickly validate and debug regular expressions.

💡 Tips & Tricks

  • Greedy vs Non-greedy
    By default, * and + are greedy (match as much as possible). Add ? to make them non-greedy
    .*?
  • Escape special characters
    To match special characters like . * + literally, escape them with backslash
    \.
  • Boundary matching
    Use ^ and $ to ensure full match and avoid partial matches
    ^\d{11}$
  • Character class shortcuts
    Uppercase versions of \d \w \s match the opposite
    \D matches non-digits
  • Multiline mode
    With m flag enabled, ^ and $ match the start and end of each line

📚 Regex Syntax Reference

.Match any single character (except newline)
\dMatch digits, equivalent to [0-9]
\wMatch word characters (letters, digits, underscore)
\sMatch whitespace (space, tab, etc.)
^Match start of string
$Match end of string
*Match 0 or more times
+Match 1 or more times
?Match 0 or 1 time
{n}Match exactly n times
{n,}Match at least n times
{n,m}Match between n and m times
[abc]Match a, b, or c
[^abc]Match any character except a, b, c
(abc)Capturing group, match and remember abc
(?:abc)Non-capturing group, match but don't remember