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  1. #!/usr/bin/perl -wn
  2. print if /^(f(o[^o]|[^o])|[^f])*$/;
  3.  
Success #stdin #stdout 0s 4596KB
comments (?)
stdin 
f, fo or barf
f
fo
barf
foo
'foo'
abdfoode
abdfode
abdfde
abcde
f

 
fo
foo
fooo
ofooa
ofo
ofoo
stdout 
f, fo or barf
f
fo
barf
abdfode
abdfde
abcde
f

 
fo
ofo
https://ideone.com/90iZj
language:
Perl (perl 5.28.1)
created:
12 years ago
visibility:
secret

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