Groups > comp.lang.python > #198080

Re: Pythonic way to combine regular expressions?

From	ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups	comp.lang.python, alt.fantasy
Subject	Re: Pythonic way to combine regular expressions?
Followup-To	comp.lang.python
Date	2026-09-26 12:22 +0000
Organization	Stefan Ram
Message-ID	<VERBOSE-20260926132029@ram.dialup.fu-berlin.de> (permalink)
References	<MrztS.208529$Nn1.7474@fx18.ams4> <names-20260926110359@ram.dialup.fu-berlin.de> <TBOtS.247604$4yM7.183409@fx08.ams4>

Cross-posted to 2 groups.

Followups directed to: comp.lang.python

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Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> wrote or quoted:
>Thank you.  I'm sure Kent Beck of /eXtreme Programming/ would be proud
>of this regular expression if he bothered to read comp.lang.python.

  That regular expression can be made more readable in Python
  using verbose regular expressions while still avoiding names
  and parentheses within the regular expression.

exp = re.compile(
  r"""
  ^ [+-]? [0-9]+ $                             # Integer (123, -45)
  |
  ^ [+-]? [0-9]+ \. [0-9]+ [eE] [+-]? [0-9]+ $ # Float with "E"
  |
  ^ [+-]? [0-9]+ \. [0-9]+ $                   # Float without "E"
  |
  ^ [+-]? \. [0-9]+ [eE] [+-]? [0-9]+ $        # Starts with ".", has E
  |
  ^ [+-]? \. [0-9]+ $                          # Starts with ".", no "E"
  |
  ^ [+-]? [0-9]+ \. [eE] [+-]? [0-9]+ $        # Ends with ".", has "E"
  |
  ^ [+-]? [0-9]+ \. $                          # Ends with ".", no "E"
  |
  ^ [+-]? [0-9]+ [eE] [+-]? [0-9]+ $           # No ".", but "E"
  """,
  re.VERBOSE,
)

Newsgroups: comp.lang.python,alt.fantasy
Followup-To: comp.lang.python

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Pythonic way to combine regular expressions? Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-26 02:54 +0800
  Re: Pythonic way to combine regular expressions? ram@zedat.fu-berlin.de (Stefan Ram) - 2026-09-25 19:08 +0000
    Re: Pythonic way to combine regular expressions? ram@zedat.fu-berlin.de (Stefan Ram) - 2026-09-25 19:19 +0000
  Re: Pythonic way to combine regular expressions? ram@zedat.fu-berlin.de (Stefan Ram) - 2026-09-26 10:04 +0000
    Re: Pythonic way to combine regular expressions? Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-26 20:09 +0800
      Re: Pythonic way to combine regular expressions? ram@zedat.fu-berlin.de (Stefan Ram) - 2026-09-26 12:22 +0000

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