[Sandwich]

For a couple of reasons, I'm looking into learning the art of pregexps. Specifically (since I don't know Perl), the PHP implementation of pregexps.

So, can anyone telll me why the following code returns "No match"?

// Perl Regular Expression test

$string = "$string beginning with a dollar sign;";
if (preg_match("/^\$/",$string)) {
echo "Match!";
} else {
echo "No match!";
}
?>

It _should_ match if the first char (first signified by ^) is an actual $ sign (as signified by the escaped dollar sign in the expression, \$). But it doesn't.

I'm thinking either it's something to do with the dollar being seen, despite it being escaped, as an end-of-string marker, or as the beginning of a PHP variable somehow.

Anybody?

[Sandwich]

Gah, figured it out. I was forgetting that the $string part of the original variable would be evaluated as a variable itself, not as direct text. Stoooopeed me.

[Styxx]

* points and laughs *

[Goober5000]

What about the Wiki pregexps?

[ZylonBane]

FYI, in Perl they're just called regex's. None of this "pregexp" nonsense. And they're not unique to Perl. Several languages and shells support them.

http://etext.lib.virginia.edu/helpsheets/regex.html

[Sandwich]

Originally posted by ZylonBane
FYI, in Perl they're just called regex's. None of this "pregexp" nonsense. And they're not unique to Perl. Several languages and shells support them.

http://etext.lib.virginia.edu/helpsheets/regex.html

Yeah, I know but in PHP there are regexps, and there are pregexps, and since it's PHP we're dealing with here... When in Rome and all that, y'know?

Goob, I'll look into that problem in a few minutes.