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Regex Tester

Test regular expressions against sample text. Useful for grep patterns, validation rules, log searches and general pattern practice.

Pattern

Regular expression Ignore case Find all matches Sample text

Results

Click Test Regex to see matches.

Highlighted Text

Useful Regex Examples

error|warning|failed matches common log problem words.
\b\d{3}\b matches three digit numbers, useful for HTTP status codes.
\d+\.\d+\.\d+\.\d+ roughly matches IPv4 addresses.
^ERROR matches lines starting with ERROR.

Open Grep Command Builder Read Advanced Grep Techniques