From the HTML::Template documentation 
Q: Why do you use /[Tt]/ instead of /t/i?  It's so ugly!

A: Simple - the case-insensitive match switch is very inefficient.
According to _Mastering_Regular_Expressions_ from O'Reilly Press,
/[Tt]/ is faster and more space efficient than /t/i - by as much as
double against long strings.  //i essentially does a lc() on the
string and keeps a temporary copy in memory.

When this changes, and it is in the 5.6 development series, I will
gladly use //i.  Believe me, I realize [Tt] is hideously ugly.

[download]
I'm sure this is probably mentioned in a few others places, but I remember cause I wrote a patch once for HTML::Template.

MJD says "you can't just make shit up and expect the computer to know what you mean, retardo!"
I run a Win32 PPM repository for perl 5.6.x and 5.8.x -- I take requests (README).
** The third rule of perl club is a statement of fact: pod is sexy.

In reply to Re: Slowness of /i by PodMaster
in thread Slowness of /i by sulfericacid

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