100% Real-Time JavaScript Regular Expression Studio
Regex (Regular Expression) Tester
Test JavaScript regular expression patterns against test text with live match highlighting, capture groups, and flag controls.
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No pattern matches found
Understanding JavaScript Regular Expression Flags
Global vs Single Match
The g flag searches for all occurrences across the string rather than stopping after the first match.
Case Insensitive Flag
The i flag ensures matching ignores uppercase and lowercase character differences.
📖 Detailed Guide & Use Cases
Debug Regular Expressions with the Regex Tester. Features real-time match highlighting, regex flag toggles (g, i, m, s, u), capture group inspection, and instant pattern validation.
❓ Frequently Asked Questions (FAQ)
It uses native JavaScript ECMAScript Regular Expressions.
Yes, full match indices, sub-groups, and detailed match counts are displayed.