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Re^3: How to split into paragraphs?

by ikegami (Pope)
on Nov 16, 2006 at 14:02 UTC ( #584463=note: print w/ replies, xml ) Need Help??


in reply to Re^2: How to split into paragraphs?
in thread How to split into paragraphs?

Ah, I see. Well, I've already provided the building blocks, but they are well hidden. Let me expose them.

You need something along the lines of /[^$chars]*/, but instead of negatively matching chars, you want to negatively match a regexp.

The direct equivalent of
/[^$chars]*/
for regexps is
/(?:(?!$re).)*/

In context,

# Input the string. my $in = do { local $/; <DATA> }; # Must move "pos" on a match. # Zero-width match won't work. my $start_pat = qr/^\S+/m; # Break the input into paragraghs. my @paras = $in =~ / \G ( $start_pat (?: (?!$start_pat). )* ) /xgs; # Manipulate the paragraghs. @paras = map { "<$_>" } @paras; # Recombine the paragraphs. my $out = join '', @paras; # Output the string. print($out); __DATA__ abc: asdf1 asdf2 def: asdf3 ghi: asdf4 asdf5


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