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前言

正则表达式在字符匹配是不可或缺的，也是非常重要的，需要我们熟练掌握。

学习平台：https://regexone.com/

常用字符匹配方法

  • abc… Letters
  • 123… Digits
  • \d Any Digit
  • \D Any Non-digit character
  • . Any Character
  • . Period
  • [abc] Only a, b, or c
  • [^abc] Not a, b, nor c
  • [a-z] Characters a to z
  • [0-9] Numbers 0 to 9
  • \w Any Alphanumeric character
  • \W Any Non-alphanumeric character
  • m Repetitions
  • {m,n} m to n Repetitions
  • * Zero or more repetitions
  • + One or more repetitions
  • ? Optional character
  • \s Any Whitespace
  • \S Any Non-whitespace character
  • ^…$ Starts and ends
  • (…) Capture Group
  • (a(bc)) Capture Sub-group
  • (.*) Capture all
  • (abc|def) Matches abc or def