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Regex Tester Pro - Advanced Regular Expression Testing Tool

Test Your Regular Expression

Regular Expression Pattern:

Flags:

Global (g) Case Insensitive (i) Multiline (m) Dot Matches Newline (s) Unicode (u) Sticky (y)

Test String:

Matches Found

Test String Length

Pattern Length

Execution Time

0ms

Regex Test Results

Highlighted Matches in Text

Regex Cheat Sheet

^ - Start of string/line (m)
$ - End of string/line (m)
. - Any char (except newline; s for newline)
\d - Digit (0-9)
\D - Not a digit
\w - Word char (a-z, A-Z, 0-9, _)
\W - Not a word char
\s - Whitespace (space, tab, newline)
\S - Not whitespace
\b - Word boundary
\B - Not word boundary
[abc] - Any of a, b, or c
[^abc] - Not a, b, or c
[a-z] - Char between a to z
[0-9] - Digit between 0 to 9
(...) - Capturing group
(?:...) - Non-capturing group
(?<name>...) - Named capturing group
a|b - a or b
a* - 0 or more of a
a+ - 1 or more of a
a? - 0 or 1 of a
a{3} - Exactly 3 of a
a{3,} - 3 or more of a
a{3,5} - Between 3 and 5 of a
*? +? ?? {n,m}? - Lazy quantifiers
(?=...) - Positive lookahead
(?!...) - Negative lookahead
(?<=...) - Positive lookbehind
(?<!...) - Negative lookbehind
\1 - Backreference to group 1
\k<name> - Backref. to named group
\xHH - Hex character code
\uHHHH - Unicode character
\t, \n, \r - Tab, Newline, Carriage Return

Regex Tester Pro is an advanced online utility for testing, debugging, and visualizing regular expressions. It offers live match highlighting, detailed capture group analysis, full flag support (g, i, m, s, u, y), sample patterns, and a comprehensive cheat sheet to help users quickly validate and refine their regex.