Python Regex AttributeError NoneType object has no attribute groups

Question

I have a string which I want to extract a subset of  This is part of a larger Python script   This is the string   import re  htmlString     lt  dd gt  lt dt gt  Fine  thank you  amp  160  lt  dt gt  lt dd gt  Molt b    gr  cies    lt i gt mohl behh  GRAH-syuhs lt  i gt      Which I want to pull-out  Molt b    gr  cies  mohl behh  GRAH-syuhs   And for that I use regular expression using re search   SearchStr       lt   dd  gt   lt dt  gt       w      s       amp    d        lt   dt  gt   lt dd  gt       w   s w s w               lt i  gt     w s   -      lt   i  gt       Result   re search SearchStr  htmlString   print Result groups   AttributeError   NoneType  object has no attribute  groups    Since Result groups   doesn t work  neither do the extractions I want to make  i e  Result group 5  and Result group 7    But I don t understand why I get this error  The regular expression works in TextWrangler  why not in Python  Im a beginner in Python

User · Answer

You are getting AttributeError because you re calling groups on None  which hasn t any methods   regex search returning None means the regex couldn t find anything matching the pattern from supplied string   when using regex  it is nice to check whether a match has been made   Result   re search SearchStr  htmlString   if Result      print Result groups

User · Answer

import re  htmlString     lt  dd gt  lt dt gt  Fine  thank you  amp  160  lt  dt gt  lt dd gt  Molt b    gr  cies    lt i gt mohl behh  GRAH-syuhs lt  i gt     SearchStr       lt   dd  gt   lt dt  gt       w      s       amp    d        lt   dt  gt   lt dd  gt       w   s w s w               lt i  gt     w s   -      lt   i  gt       Result   re search SearchStr decode  utf-8    htmlString decode  utf-8    re I   re U   print Result groups     Works that way  The expression contains non-latin characters  so it usually fails  You ve got to decode into Unicode and use re U  Unicode  flag   I m a beginner too and I faced that issue a couple of times myself

[python] Python + Regex: AttributeError: 'NoneType' object has no attribute 'groups'

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