Pattern

JavaScript RegExp syntax. Do not wrap with slashes.

Waiting

Test Text

Try one value per line for validation work.

Replacement string

Code flavor

Workbench

0 matches

Pattern Library

Validation starters. Confirm official formats before production enforcement.

Reference Notes

Useful syntax references for the implemented engine.

RegExp basics

JavaScript regex methods include exec, test, match, matchAll, replace, search and split.

MDN guide

Groups

Capture groups and named groups are surfaced in the Matches tab.

MDN groups

Unicode

Unicode property escapes need the unicode flag in many practical patterns.

MDN unicode

Lookbehind

Lookbehind assertions are useful but can behave differently from left-to-right matching intuition.

MDN lookbehind

Test regex patterns against real African data shapes.