What happens in php if you put the $ in a character class; e.g. [$] ?
Peter West
And he said to them, "Do you not yet understand?"
On 21 Feb 2014, at 5:34 am, Daevid Vincent <daevid@xxxxxxxxxx> wrote:
> I've started writing the tool (which I will post when finished for others to use).
>
> However, I have a few questions about preg_replace():
>
> How do I search for '$' literal? I thought it was just backslash escape it but that isn't matching (as indicated by the semi-colon in the output)
>
> php > echo preg_replace("/<\?=(\$.+?);?\s*\?/", '<?= '.trim("$1").' ?>', 'Username: <?= $username; ?>')."\n";
> Username: <?= $username; ?>
>
> For fun I tried without the \$ and just $ but same thing.
>
> php > echo preg_replace("/<\?=($.+?);?\s*\?/", '<?= '.trim("$1").' ?>', 'Username: <?= $username; ?>')."\n";
> Username: <?= $username; ?>
>
> Taking off the $ check all together I get the match, but then how can I apply trim() to the match? The documentation seems to imply this should work no? http://php.net/preg_replace
>
> php > echo preg_replace("/<\?=(.+?);?\s*\?/", '<?= '.trim("$1").' ?', 'Username: <?= $username; ?>')."\n";
> Username: <?= $username ?>
>
> For sanity I tried a few other things and it doesn't appear that the chosen function is processing the match variable $1?
>
> php > echo preg_replace("/<\?=(.+?);?\s*\?/", '<?= '.trim('$1').' ?', 'Username: <?= $username; ?>')."\n";
> Username: <?= $username ?>
>
> php > echo preg_replace("/<\?=(.+?);?\s*\?/", '<?= '.md5('$1').' ?', 'Username: <?= $username; ?>')."\n";
> Username: <?= 06d3730efc83058f497d3d44f2f364e3 ?>
>
> php > echo preg_replace("/<\?=(.+?);?\s*\?/", '<?= '.md5('$1').' ?', 'Username: <?= $foo; ?>')."\n";
> Username: <?= 06d3730efc83058f497d3d44f2f364e3 ?>
>
> echo preg_replace("/<\?=(.+?);?\s*\?/", '<?= '.md5("$1").' ?', 'Username: <?= $foo; ?>')."\n";
> Username: <?= 06d3730efc83058f497d3d44f2f364e3 ?>
>
> Notice how the MD5 didn't change, indicating that it's MD5'ing the literal string '$1' and verified by this
>
> php > echo md5('$1')."\n";
> 06d3730efc83058f497d3d44f2f364e3
>
> *sigh*
>
> Ultimately I was able to craft a regex that I think will work in this instance
>
> php > echo preg_replace("/<\?=\s*(.+?);?\s*\?/", "<?= $1 ?", 'Username: <?= $username; ?>')."\n";
> Username: <?= $username ?>
>
> But I'd like to know the answers to the two questions above for future reference
>
>
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