Dynamically building pattern for regex or ??

[csteinhilber]

I'm trying to devise a way to remove everything from a string up to and including a given substring. Basically an extension of the stristr() function.

I wrote a custom function like:

function stristrplus($haystack,$needle){

  // remove everything up to needle
  $haystack=stristr($haystack, $needle);
  // now remove needle as well
  $haystack=substr($haystack, strlen($needle));	

  return $haystack;

}

This works fine... unless $haystack contains CRLF's in it's version of $needle.

Example:

  $needle = "=end of page=";

  $haystack =" 
Lorem ipsum dolor sit amet,
consectetuer adipiscing elit,
aliquip ex ea commodo.
=end of paragraph=

Lorem ipsum dolor sit amet,
suscipit lobortis nisl ut
aliquip ex ea commodo.
=end of paragraph=

Lorem ipsum dolor sit amet,
consectetuer adipiscing elit,
aliquip ex ea commodo.
=end of paragraph==end of
page=

Lorem ipsum dolor sit amet,
suscipit lobortis nisl ut
aliquip ex ea commodo.
=end of paragraph=";

stristrplus() fails because "=end of \npage=" doesn't equal "=end of page="

I rewriting stristrplus() with a eregi statement, like:

function stristrplus($haystack,$needle){

  $needle = strReplace(" ","[\s]*",$needle);
  $needle = "[\s\S]*" . $needle;
  // remove everything up to and including needle
  $haystack=eregi_replace($needle, "",$haystack);
  return $haystack;

}

but I can't figure out how to dynamically build the pattern (the $needle = lines above don't work).

Anyone have any ideas? How to fix the above, or any other tacts/directions?

Thanks,
-Carl

Hope it helps,
-Carl

 

[csteinhilber]

Nevermind.
Figured it out.

Switched to preg_replace and used the /s modifier.

function stristrplus($haystack,$needle){

	$haystack = trim($haystack);
	$haystack = preg_replace("/.*?" . $needle . "/si","", $haystack);

	return $haystack;

}

Hope it helps,
-Carl