I am parsing some c++ files and at one point I need to extract any subroutine calls in a subroutine.

My current strategy is: 

foreach my $line ( @sub_code ) {
    foreach my $sub ( keys %SUBS ) {
        if ( $line =~ /[^a-zA-Z]$sub[^a-zA-Z]*\(/ ) { push( @subs, $ke
+y ) }
    }
}

[download]
Which extracts the subroutine calls okay but it ends up being called 15,427 times and take 64+ seconds.

So is there any way to tune that regex or perhaps I should find a regex strategy to capture all subroutine calls at once for a subroutine block?

Can you nudge a disciple in the right direction?

In reply to Slow Regex - How to Optimize by noslenj123

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