Title: Warning error in function Pregmatch
Last modified: August 21, 2016

---

# Warning error in function Pregmatch

 *  [occo78](https://wordpress.org/support/users/occo78/)
 * (@occo78)
 * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-error-in-function-pregmatch/)
 * I get the following error
    Warning: preg_match() [function.preg-match]: Compilation
   failed: unrecognized character after (?< at offset 19 in /home/a8734332/public_html/
   wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/router/
   mixin.url_manipulation.php on line 161
 * A quick search on Google shows that several WordPress sites have the same error
   for example :
    [http://www.nickmohammed.com/index.php/nggallery/slideshow?page_id=5/](http://www.nickmohammed.com/index.php/nggallery/slideshow?page_id=5/)
 * [http://wordpress.org/plugins/nextgen-gallery/](http://wordpress.org/plugins/nextgen-gallery/)

Viewing 1 replies (of 1 total)

 *  Plugin Contributor [photocrati](https://wordpress.org/support/users/photocrati/)
 * (@photocrati)
 * [12 years, 5 months ago](https://wordpress.org/support/topic/warning-error-in-function-pregmatch/#post-4443366)
 * [@occo78](https://wordpress.org/support/users/occo78/) – Thanks for this information,
   we are aware of this error message but it is only occurring on some sites and
   not at all on any of our test sites although we are trying to find a consistent
   solution.
 * By any chance, have you checked to see if this is a possible plugin or theme 
   conflict?
 * – Cais.

Viewing 1 replies (of 1 total)

The topic ‘Warning error in function Pregmatch’ is closed to new replies.

 * ![](https://ps.w.org/nextgen-gallery/assets/icon-256x256.png?rev=2083961)
 * [Photo Gallery, Sliders, Proofing and Themes - NextGEN Gallery](https://wordpress.org/plugins/nextgen-gallery/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/nextgen-gallery/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/nextgen-gallery/)
 * [Active Topics](https://wordpress.org/support/plugin/nextgen-gallery/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/nextgen-gallery/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/nextgen-gallery/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [photocrati](https://wordpress.org/support/users/photocrati/)
 * Last activity: [12 years, 5 months ago](https://wordpress.org/support/topic/warning-error-in-function-pregmatch/#post-4443366)
 * Status: not resolved