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About regex101
regex101 explains every token of your regular expression in real time across PCRE, JavaScript, Python, and more — the tool that makes regex learnable.
Key features
- Live match highlighting
- Token-by-token explanation
- Flavor switching and debugger
Pros
- Turns regex into a teachable moment
- Free, no account needed
Cons
- Complex patterns still melt brains
- Occasional flavor edge cases
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