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Answer to regex golf http://regex.alf.nu/
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| plain = r'foo' | |
| anchor = r'k$' | |
| ranges = r'^[a-f]*$' | |
| backrefs = r'(...).*\1' | |
| abba = (r'^(?!' # don't ( | |
| r'.*(.)(.)\2\1.*' # parttern like abba | |
| r'$)') # ) select | |
| plan = r'^(.)(.).*\2\1$' | |
| prime = (r'^(?!' # don't ( | |
| r'(xx+?)\1+' # parttern that 'x' group (length > 1) is repeated | |
| r'$)') # ) select | |
| four = r'(.).\1.\1.\1' | |
| order = r'^[a-h]*[i-z]*$' # cheat a bit, try to find a good split spot | |
| triples = 'link: http://quaxio.com/triple/' # tough, see this blog that | |
| # construct a FSM first | |
| glob = (r'^(\w*) matches \1$|' # no star | |
| r'^(\w*)\*(\w*) matches \2\w+\3$|' # one star | |
| r'^(\w*)\*(\w*)\*(\w*) matches \4\w+\5\w+\6$|' # two star | |
| r'^(\w*)\*(\w*)\*(\w*)\*(\w*) matches \7\w+\8\w+\9\w+\10$') | |
| glob2 = (r'^(\*?)(\w*)(\*?)(\w*)(\*?)(\w*)' | |
| r' .* ' # matches | |
| r'((.(?!\1))+|\1)\2((.(?!\3))+|\3)\4((.(?!\5))+|\5)\6$') | |
| # ((.(?!\1))+|\1) is used to conditionally match .+ if \1 if found (via @hadrel) | |
| balance = r'^(<(<(<(<(<(<(<>)*>)*>)*>)*>)*>)*>)*$' | |
| powers = (r'^(?!' # don't ( | |
| r'(x(xx)+)' # parttern that odd number of 'x' | |
| r'\1*' # is repeated | |
| r'$)') # ) select (via @plby) |
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Nooo!
Wish I hadn't seen this. Must. not. cheat.