Regex Tester

Regular expressions (regex) are a powerful tool for searching, validating, and processing text data. They are used in programming, system administration, log analysis, and string processing. This tester allows you to test regular expressions in real time with match highlighting.

How to Use the Tester Enter a regular expression in the pattern field (without delimiter characters / /), select the desired flags, and paste the test text. All matches will be highlighted in the text, and a list with capture groups will appear below. The g (global) flag finds all matches, i — ignores case, m — multiline mode, s — allows dot to match newlines.

Regular Expression

Flags

g (global)

i (case-insensitive)

m (multiline)

s (dotAll)

Test String

Highlighted Matches

Free online regular expression tester with real-time match highlighting. Enter a pattern and test text — the tool instantly finds all matches and highlights them directly in the text. All major flags are supported: global search (g), case-insensitive (i), multiline (m), and dotAll (s).

Regular expressions (regex) are a powerful tool for searching, validating, and processing text data. They are used in programming, system administration, log analysis, data parsing, and many other fields. Capture groups — both named and numbered — are displayed for each match, helping you understand match structure.

The match counter shows the total number of results found. The tool automatically handles pattern errors and displays a clear error message. Perfect for developers writing and debugging regular expressions for email, phone, and URL validation, HTML parsing, and string processing.