regex unknown modifier

Question

I keep getting this error when using preg_replace that's mixed with some html.

Warning: preg_replace(): Unknown modifier 'd'

here is the code I used.

it's removing that bit of html from the beginning of a string that contains html.

$foo = preg_replace("/^<div id='IDHERE'>sometext.</div>/", '', $foo);

Answer 1

You need to escape the / because it is used to end the first part of the regex string, after which a modifier such as g (global) is used and d is not a valid option there (the d from div).

Make it \/

            $foo = preg_replace("/^<div id='IDHERE'>sometext.<\/div>/", '', $foo);

Answer 2

Escape the closing </div> tag:

$foo = preg_replace("/^<div id='IDHERE'>sometext.<\/div>/", '', $foo);

PHP was interpreting the forward slash in the closing div tag as being the end of the expression:

/^<div id='IDHERE'>sometext.</div>/
                             ^ PHP thinks this is the end,
                               then complains about the unknown modifier 'd'

Answer 3

add \ in your pattern:

 $foo = preg_replace("/^<div id='IDHERE'>sometext.<\/div>/", '', $foo);

and here reference.

Answer 4

You need to escape / in </div>, so your regex should be:

$foo = preg_replace("/^<div id='IDHERE'>sometext.<\/div>/", '', $foo);