Regex Sheet door Eric

Regex Cheatsheet decodes a regular expression character by character.

Features:
- Token-by-token explanation: classes, groups, anchors, quantifiers, flags
- Lookahead, lookbehind, named groups, lazy quantifiers
- Flag descriptions (g, i, m, s, u, y, d)
- Accepts /pattern/flags syntax or bare pattern
- Optional test string: shows matches with capture groups
- 100% offline

For developers reading regex they didn't write, and people learning regex.