Regex cheatsheet
Symbols · quantifiers · anchors · full patterns · common snags
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A table of regex symbols and ready-made patterns. Look things up by what you are trying to do rather than by symbol name, and paste them straight in.
How to use it
- Search for what you need (email, digits, start of line…)
- Narrow it down with the category chips
- Click a snippet to copy it
- Try it out in the regex tester
Common questions
- Why is it organised by what you are trying to do?
- In a regular expression a single symbol is the rule, so you get stuck at “what was that symbol again”. Searching by intent is faster than scanning a list of symbols.
- Why does \w not match my language?
- \w means Latin letters, digits and the underscore only. To catch other scripts use a range such as [가-힣] or turn on the Unicode flag.
- Is the email pattern perfect?
- A perfect email regex is effectively impossible. The one here is good enough for practical use; the real check is sending a confirmation mail.
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