refrf.dev

An experimental, largely visual and example-based open source online book about regular expressions. It is intended for regex beginners with some programming experience and covers basics such as character classes, escapes, groups, repetition, alternation, flags, anchors and lookaround. A single-page version is available for printing.

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0 shouts Added Sep 23, 2026 refrf.dev
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  • A single-page version of the book is available Source: refrf.dev

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