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B.7 Appendix Summary

Appendix B covers:

  • Thinking about what you can use a regular expression for.

  • Understanding the difference between literals and metacharacters.

  • Using the metacharacters . (dot) and | (bar).

  • Using the quantifiers *, +, ?, {x}, {x,}, and {x,y}.

  • Anchoring a regular expression with ^ or $.

  • Anchoring a regular expression with \b or \B.

  • Using a character class.

  • Using a negated character class.

  • Using character class metacharacters such as \d, \D, \w, \W, \s, and \S.

  • Understanding greed (in a regular expression context, at least).

  • Making quantifiers greedy or nongreedy.

  • Matching with preg_match( ).

  • Capturing with preg_match( ).

  • Matching and capturing with preg_match_all( ).

  • Using backreferences in a regular expression.

  • Replacing with preg_replace( ).

  • Using backreferences when replacing.

  • Making an array from a string with preg_split( ).

  • Selecting array elements with preg_grep( ).

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