Grok Patterns Contd

Regular Expressions

• Characters
  • Escape character: \
  • Any character: .
  • Digit: \d
  • Not a digit: \D
  • Word character: \w
  • Not a word character: \W
  • Whitespace: \s
  • Not whitespace: \S
  • Word boundary: \b
  • Not a word boundary: \B
  • Beginning of a string: ^
  • End of a string: $
• Groupings
  • Matches characters in brackets: [ ]
  • Matches characters not in brackets: [^ ]
  • Either or: |
  • Capturing group: ( )
• Quantifiers
  • 0 or more: *
  • 1 or more: +
  • 0 or 1: ?
  • An exact number of characters: { }
  • Range of number of characters: {Minimum, Maximum}
• refer to the classroom video for examples