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Re: RegEx to filter \s not between labels

by I0 (Priest)
on May 23, 2002 at 00:30 UTC ( #168628=note: print w/ replies, xml ) Need Help??

in reply to RegEx to filter \s not between labels

$text =~ s/\s+|(STARTPRESERVE.*?STOPPRESERVE)/${[$1,' ']}[!$1]/gs

UPDATE: jeffa, If you think that's twisted, you should see the version for nested START STOP markers:-)

to remove the markers:
s/\s+|STARTPRESERVE(.*?)STOPPRESERVE/${[' ',$1]}[defined $1]/gs

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(tye)Re: RegEx to filter \s not between labels
by tye (Sage) on May 23, 2002 at 01:59 UTC

    ++I0! Minor changes to remove the start/stop markers which I think was desired:

    # The golfish way: $text =~ s#(\s)\s+|STARTPRESERVE(.*?)STOPPRESERVE#$1$2#gs; # Update: Oops! This fails if a run # of whitespace doesn't start with ' '. # or, if you don't like warnings: $text =~ s#\s{2,}|STARTPRESERVE(.*?)STOPPRESERVE# defined $1 ? $1 : " " #seg;

            - tye (but my friends call me "Tye")
Re: Re: RegEx to filter \s not between labels
by gryphon (Abbot) on May 23, 2002 at 16:27 UTC

    Greetings I0,

    ++! That's amazingly cool code. I love one-liners like that. In my specific situation, I don't need the START/STOP markers removed, and I can't imagine a senario where the data string would contain nested labels, however... I'm still curious. How would the nested labels version look?

    (Note that I did spend some time trying to figure this out for myself so I could at least post a few bits of code here for others to revise, but I've failed to figure out even the basic theory without going into many, many lines of basic code.)

    code('Perl') || die;

      #Okay, you asked for it:
      $_ = '0 1 STARTPRESERVE STARTPRESERVE 2 STOPPRESERVE STOPPRESERVE 3 4 STARTPRESERVE STARTPRESERVE 5 STOPPRESERVE STOPPRESERVE 6 7'; (my $re=$_)=~s/((STARTPRESERVE)|(STOPPRESERVE)|.)/${['(','']}[!$2]\Q$1 +\E${[')','']}[!$3]/gs; $re= join'|',map{quotemeta}eval{/$re/}; die $@ if $@ =~ /unmatched/; s/\s+|($re)/${[$1,' ']}[!$1]/g;

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