python - Strange reg output -

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i using regular expression identify days of week , have following regular expression 

(?:mon(?:(?:.)?|(?:day)?)|tue(?:(?:.)?|(?:sday)?))

my test file contains

monday mon mon.

when run code recognizes mond, mon, , mon.. why not recognizes monday? appreciated.

i'm using python 2.7.6

your regex fauly actually. try simplified regex:

(?:mon|tue(?:s)?)[.]?(?:day)?

online demo: http://regex101.com/r/jc2iw3


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