Regex Tester

Test regular expressions against sample text. See matches in real-time, validate patterns, and debug regex issues.

Inputs

Regular Expression Pattern

Test String

Regex Flags

Tab to move between fields

Results

Pattern Status

Enter a pattern

Matches Found

Matches

Error Message

How to Use This Calculator

Type your Regular Expression Pattern in the first field (e.g., \d+ to match numbers).
Paste the Test String you want to search through into the second field.
Choose Regex Flags — 'g' finds all matches, 'i' ignores case, 'm' enables multiline mode.
The Pattern Status instantly confirms whether your expression is valid or shows an error message.
Review Matches Found and the Matches list to verify your pattern captures the correct substrings.

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