Previous code was eliminating newlines. This one is matching a literal "space" instead of "\s".

It is better documented, too :)

$text =~ s/
        [ ]+ |                  # spaces, or:
        (                       # begin $1
            STARTPRESERVE(\d?)  #     STARTPRESERVE + $2
            .*?                 #     anything
            STOPPRESERVE\2      #     STOPPRESERVE + $2
        )                       # end $1
    /${ [$1,' '] }[ ! $1 ]/sgx;

# [$1,' '] is an unnamed array.
# ! $1 is:
#     0 if $1 exists;
#     1 if spaces were found.

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In reply to Re: RegEx filter \s ! between labels, part 2 by fglock
in thread RegEx filter \s ! between labels, part 2 by gryphon

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