正規表現まとめ(Python)

Python

正規表現のまとめ(Python)
Automate Boring Stuff with Python, Chapter 7: Pattern Matching with Regular Expressions.の内容をメモ。

全般

reモジュールをimportして使う。re.compile()でregex objectを作成して, これをsearch()メソッドやfindall() メソッドで探す。

>>> import re
>>> phoneNumRegex = re.compile(r'\d\d\d-\d\d\d-\d\d\d\d')
>>> mo = phoneNumRegex.search('My phone number is 415-555-4242.')
>>> print('Phone number found: ' + mo.group())
Phone number found: 415-555-4242

なお、regexパターンのテストはhttps://pythex.org/でできる。

まとめ

  • The ? matches zero or one of the preceding group.
  • The * matches zero or more of the preceding group.
  • The + matches one or more of the preceding group.
  • The {n} matches exactory n of teh preceding group.
  • The {n,} matches n or more of the preceding group.
  • The {,m} matches 0 to m of the preceding group.
  • The {n,m} matches at least n and at most m of the preceding group.

References