Regex Cheatsheet - Regular Expression Quick Reference
Quick reference for regular expression patterns. Character classes, quantifiers, anchors, and common patterns.
Character Range [a-z]
Character ClassMatches lowercase letter from a to z
Pattern
[a-z]Syntax
Explanation
Character range uses hyphen for contiguous sets. [a-zA-Z] matches all letters.
Examples
[a-z]+Matches lowercase letter sequence
Matches: hello
[A-Z]+Matches uppercase letter sequence
Matches: HELLO
[0-9]+Matches digit sequence
Matches: 12345
[a-zA-Z]+Matches all letters
Matches: HelloWorld
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