On: Regex Golf

[bencoder]

what's the pattern on "Abba"? I thought it was just to exclude doubled letters but I have doubles on two words on the left hand side as well (noisefully and effusive, in case the word lists are the same)

[shdon → bencoder]

Excluding doubled consonants that have the same vowel on both sides of the pair:

  ^((?!([aeiou])([^aeiou])\3\2).)*$

The following also works for the testcases and is shorter:

  ^((?!(.)(.)\3\2).)*$

[surreal → shdon]

Can get 2 more points with:

  ef|^((?!(.)\2).)*$

But I reckon yours wins for having a pair of breasts in the middle

[moron4hire → bencoder]

well, if you are strictly interested in matching with the fewest characters, regardless of the apparent pattern:

  ^(.)(.).*\2\1$

[danielweber → moron4hire]

Your anchors at the end make it match nothing.

[moron4hire → danielweber]

sorry, misreplied. This was for palindromes.

[abus → bencoder]

5. Abba (^unv|.u|z|ph|mi|st|vi|tan)

haha