Re^2: Regex: first match that is not enclosed in parenthesis

Finding in my case means to return the prefix and postfix substrings.

I also thought of this. This way one could just find the substring before and after the retrieved position.
Good Idea.

Comment on Re^2: Regex: first match that is not enclosed in parenthesis

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Re^3: Regex: first match that is not enclosed in parenthesis by hdb (Monsignor) on Jun 30, 2013 at 16:53 UTC
Something like this: `use strict; use warnings; my $input = "1(2+3)(3+4)+5*(6+7)"; my $level = 0; my $tab = "\| "; my %action = ( '(' => sub { print "\n", $tab x ++$level, shift }, ')' => sub { print "\n", $tab x $level--, shift }, '+' => sub { print "This one>>>" unless $level; print +shift }, 'default' => sub { print shift }, ); ( $action{$_} // $action{'default'} )->($_) for $input =~ /./g;` [download] The additional effort is only worthwhile if you have ambitions beyond your initial question.	[reply] [d/l]
Re^3: Regex: first match that is not enclosed in parenthesis by LanX (Saint) on Jun 30, 2013 at 16:23 UTC
Sounds like what you really need is a lexer. hdb regularly posts such solutions based on dispatch tables, worth searching for... HTH! =) Cheers Rolf ( addicted to the Perl Programming Language)	[reply]