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  1. import re
  2. old = 'regexregex'
  3. new = re.sub(r'regex(group)?regex', r'something\1something', old)
  4. print(new)
Runtime error #stdin #stdout #stderr 0.01s 9008KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Traceback (most recent call last):
  File "prog.py", line 3, in <module>
  File "/usr/lib/python2.7/re.py", line 155, in sub
    return _compile(pattern, flags).sub(repl, string, count)
  File "/usr/lib/python2.7/re.py", line 291, in filter
    return sre_parse.expand_template(template, match)
  File "/usr/lib/python2.7/sre_parse.py", line 831, in expand_template
    raise error, "unmatched group"
sre_constants.error: unmatched group
https://ideone.com/UVzXOQ
language:
Python (cpython 2.7.16)
created:
8 years ago
visibility:
secret

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