Regular Expressions: The Complete Tutorial

are open source PCRE engine (used in many tools and languages like PHP), the library. NET regular expression and regular … .

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Regular Expressions The Complete Tutorial

  1. Regular Expression Tutorial…3
  2. Literal Characters …6
  3. First Look at How a Regex Engine Works Internally…9
  4. Character Classes or Character Sets…11
  5. The Dot Matches (Almost) Any Character…16
  6. Start of String and End of String Anchors …19
  7. Word Boundaries …24
  8. Alternation with The Vertical Bar or Pipe Symbol…26
  9. Optional Items…28
  10. Repetition with Star and Plus…30
  11. Use Round Brackets for Grouping …34
  12. Named Capturing Groups…40
  13. Unicode Regular Expressions …43
  14. Regex Matching Modes…49
  15. Atomic Grouping and Possessive Quantifiers …51
  16. Lookahead and Lookbehind Zero-Width Assertions…58
  17. Testing The Same Part of a String for More Than One Requirement…63
  18. Continuing at The End of The Previous Match…66
  19. If-Then-Else Conditionals in Regular Expressions…68
  20. Adding Comments to Regular Expressions …70

Example

  1. Sample Regular Expressions …73
  2. Matching Floating Point Numbers with a Regular Expression…75
  3. How to Find or Validate an Email Address …77
  4. Matching a Valid Date…82
  5. Matching Whole Lines of Text …84
  6. Deleting Duplicate Lines From a File…86
  7. Find Two Words Near Each Other…88

 

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