Regular Expressions CheatSheet

Basics

Regular expressions always start with / / and g is for global.

• / expression /, i.e /[A-Z]+/g basic format
• / name\?\*\\/ escape special characters with backslashes
• () group with parentheses
• | logical OR

Character classes

• \w word \d digit \s whitespace (tabs, line breaks)
• \W NOT word \D NOT digit \S NOT whitespace
• \t tabs, \n line breaks
• . any character

Anchors

• ^world start of the strings
• world$ end of the string

Brackets

• [xyz] match any x, y, z
• [^xyz] NOT x, y, z
• [B-X] match any capital letters between B & X.

Quantification

• viki|maria match viki or maria
• z{n} n occurrences
• z* zero or multiple occurrences
• z+ one or multiple occurrences
• z{min, max} min/max occurrences
• z? zero or one occurrences