Online Regular Expressions
Lessons and tips
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Cheat Sheet
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Regex Crossword Game
global ≡ Don't return after first match
multi line ≡ ^ and $ match start/end of line
insensitive ≡ Case insensitive match
extended ≡ Ignore whitespace
single line ≡ Dot matches newline
unicode ≡ Match with full unicode
Ungreedy ≡ Make quantifiers lazy
Anchored ≡ Anchor to start of pattern, or at the end of the most recent match
J ≡ Allow duplicate subpattern names
Dollar end only ≡ $ matches only end of pattern
Execute
Test Strings
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Replacement
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