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  1. import re
  2. p = re.compile(ur'''(?P<Alternation1>
  3.      \$\{(?P<braced>[_a-zA-Z][a-zA-Z0-9]*(?::[_a-zA-Z]\w*)+)
  4.      \}
  5.      )
  6.      |
  7.      (?P<Alternation2>
  8.       \$(?P<named>[_a-zA-Z][a-zA-Z0-9]*(?::[_a-zA-Z]\w*)+
  9.      )
  10.     )
  11. ''', re.VERBOSE)
  12. test_str = u"asdasd $asd:sd + ${asd123:asd} $HOME $$asd"
  13.  
  14. print [x for x in re.findall(p, test_str)]
Success #stdin #stdout 0.01s 7692KB
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stdin
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Standard input is empty
stdout
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[(u'', u'', u'$asd:sd', u'asd:sd'), (u'${asd123:asd}', u'asd123:asd', u'', u'')]
https://ideone.com/4oWguB
language:
Python (cpython 2.7.16)
created:
10 years ago
visibility:
public

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