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But i dont think this will scale very well... (and probably has subtle problems anyway)

One quibble is that because \d is a subset of \w then a string such as "abc123def" will get \w{9} in your version. Here's a slightly improved version (for some definition of improved)

my $string=" \aabc123def!*#\n"; $string=~s{ ([[:digit:]]+) |([[:alpha:]]+) |([[:punct:]]+) |([[:space:]]+) |([[:cntrl:]]+) |(.) } { defined($1) ? '[[:digit:]]{'.length($1).'}' : defined($2) ? '[[:alpha:]]{'.length($2).'}' : defined($3) ? '[[:punct:]]{'.length($3).'}' : defined($4) ? '[[:space:]]{'.length($4).'}' : defined($5) ? '[[:cntrl:]]{'.length($5).'}' : "\Q$+\E" # anything else? }gex; print $string;

But it still has problems (for example, \n is in both :space: and :cntrl: so "\n\a" produces [[:space:]]{1}[[:cntrl:]]{1}, but "\a\n" produces [[:cntrl:]]{2}).

In reply to Re: Re: Regular Expression Builder by Anonymous Monk
in thread Regular Expression Builder by Rich36

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