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Postings from January 2001
> I once brutalized Henry Spencer's engine into telling me when I was
> on my way to a match. This was for a UI: I wanted to be able to say
> that the input should only match this RE, and if they typed something
> that broke the match, I could beep and disallow the character.
>
> I was just a greenhorn then, so it coredumped. But it's another use
> for access to internal engine states and failure reasons.
Good point. Perhaps, on failure, a regex could set $@ to indicate what the
problem was:
while (gui_getchar($nextchar)) {
$input.$nextchar =~ m/$pattern/;
if ($@ =~ /fail/) { beep }
else { $input .= $nextchar }
}
Damian
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