Re: How do I change substitution options within a program?

Replies are listed 'Best First'.
Re^2: How do I change substitution options within a program? by crashtest (Curate) on Oct 31, 2006 at 23:28 UTC
See perlop, namely qr/PATTERN/options. With qr// you can change imosx options as you wish within dynamically generated patterns. I read your comment as meaning you can set the regex options from variables when using `qr//`. However, none of the following work for me: `$mods = "im"; $test = qr/xyz/$mods; # Syntax error. $test = qr/xyz/"$mods"; # Ditto. $test = qr/xyz/\$mods; # Ditto. # ... out of ideas.` [download] Could you clarify your post? What can you do with `qr//` and modifiers that you can't with `m//` or `s///`?	[reply] [d/l] [select]
Re^3: How do I change substitution options within a program? by ikegami (Patriarch) on Oct 31, 2006 at 23:41 UTC
Nothing. Maybe he was thinking of the following: `# XXX WRONG DON'T USE THIS $re = qr/$re/i if $opt{i}; $re = qr/$re/m if $opt{m}; $re = qr/$re/s if $opt{s}; $re = qr/$re/x if $opt{x};` [download] On the other hand, the following does work: `$re = "(?i:$re)" if $opt{i}; $re = "(?m:$re)" if $opt{m}; $re = "(?s:$re)" if $opt{s}; $re = "(?x:$re)" if $opt{x};` [download]	[reply] [d/l] [select]