MySoftTools
Back to Text Analyzers
Text Analyzers

Regex Tester

Live test regex expressions against strings with full highlighted matching scopes.

Regex Expression

//gi
Test Subject Input
Highlighted Preview0 matches found
No matches to display

About Online Regex Tester

Our free online Regex Tester is a client-side utility to validate regular expressions and inspect matched strings in real-time. Highlights group captures, lists coordinates, and prevents infinite loops on zero-width match tokens.

How to use Online Regex Tester

  1. Input your regular expression inside the slash fields. Toggle matching flags (global, case-insensitive, etc.).
  2. Write or paste target copy inside the 'Test Subject Input' text area.
  3. Inspect the highlighted text block for exact position highlights and view the breakdown table below for group index statistics.

Frequently Asked Questions