RegEx CheatSheet

This quick-sheet supplements the materials for my regular expressions workshop

A proper cheat-sheet: https://www.cheatography.com/davechild/cheat-sheets/regular-expressions/

Character Classes

• \w - word character
• \d - digit
• \s - space
• \b - word boundary

Wild card

• . - wild card (matches anything)

Multipliers

• ? - optionality: 0 or 1
• + - one or more
• * - 0 or more
• {99,99} - where 99 is a digit

Groups and Sets

• ( ) - use with | (pipe character) for optionality.
  • “a or b” = (a|b). Can use with String Replacement (below)
    
• [ ] - a range of charcters.
  • For example characters a through g: [a-g]
    
  • characters “L”, “C”, “I”, and “D”: [CDLI]

String Replacement

• $n
  • e.g. $1, $2