Title: Warning: preg_match() [function.preg-match]: Errors Last modified: August 19, 2016 --- # Warning: preg_match() [function.preg-match]: Errors * [methystic](https://wordpress.org/support/users/methystic/) * (@methystic) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/) * My Dashboard currently shows repeated errors where content should be under the headings: * Plugins Wordpress Development Blog Other WordPress News * Warning: preg_match() [function.preg-match]: Compilation failed: unknown option bit(s) set at offset 0 in /usr/home/kilicent/public_html/wp-includes/class-simplepie. php on line 11043 * and a single error on the Contact Us page: Warning: preg_replace() [function. preg-replace]: Compilation failed: unknown option bit(s) set at offset 0 in / usr/home/kilicent/public_html/wp-includes/shortcodes.php on line 228 * which disappears when the contact form from FS Contact is removed. * I’ve reinstalled WordPress, disabled all plugins new & old, reactivated, reverted the theme to no avail. I had a forwarder on the domain whilst I was messing with the new configurations, but have since removed this – I also put permalinks on default state because of other suggestions, but not really seeing how that is the problem. * I did a Web search but only found references with Chinese text – I’m unfortunately not a Chinese speaker. * Any ideas? Much appreciated Deborah * site is: [http://www.kilicentre.org](http://www.kilicentre.org) Viewing 14 replies - 1 through 14 (of 14 total) * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1868813) * What version of PHP are you using? * Did you try a totally fresh download of WordPress? * Thread Starter [methystic](https://wordpress.org/support/users/methystic/) * (@methystic) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1868847) * Hey * Using PHP version 5.3.4. Didn’t do a totally fresh install just Automatic re- install via Updates. Apprehensive to do a complete fresh install if there is a work around or a fixable conflict. * TIA Deborah * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1868966) * Delete WP-includes and WP-admin and copy them back up from a fresh download. You won’t lose any data 🙂 * [rhyous](https://wordpress.org/support/users/rhyous/) * (@rhyous) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869014) * My hosting server is getting this too. It was just upgraded to PHP 5.3.4 last night. * [rhyous](https://wordpress.org/support/users/rhyous/) * (@rhyous) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869015) * I also get these on the admin page. * Warning: preg_match_all() [function.preg-match-all]: Compilation failed: unknown option bit(s) set at offset 0 in /usr/home/rhyous/public_html/wp-includes/compat. php on line 102 * Warning: array_slice() expects parameter 1 to be array, null given in /usr/home/ rhyous/public_html/wp-includes/compat.php on line 103 * Warning: implode() [function.implode]: Invalid arguments passed in /usr/home/ rhyous/public_html/wp-includes/compat.php on line 104 * [rhyous](https://wordpress.org/support/users/rhyous/) * (@rhyous) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869017) * Looks like my errors are due to plugins: * Contact Form 7 Display Last Post(s) * Maybe others. * [rhyous](https://wordpress.org/support/users/rhyous/) * (@rhyous) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869020) * Also the errors on the admin page are their even with all plugins disabled! * [rhyous](https://wordpress.org/support/users/rhyous/) * (@rhyous) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869022) * > Delete WP-includes and WP-admin and copy them back up from a fresh download. > You won’t lose any data 🙂 * That did not work. * [rhyous](https://wordpress.org/support/users/rhyous/) * (@rhyous) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869028) * Reverted PHP to 5.3.3 and the errors are gone. * There must be a change in PHP 5.3.4 that WordPress doesn’t handle. * Are there bugs submitted on this already? * Thread Starter [methystic](https://wordpress.org/support/users/methystic/) * (@methystic) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869053) * Worked for me, thank you so much! * Best Deborah * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869057) * Can you try 5.3.5? There’s a bugfix to the .4 version… * [Andrew Nacin](https://wordpress.org/support/users/nacin/) * (@nacin) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869150) * PHP 5.3.5 is an unrelated security fix. * PHP 5.3.4 included an update to the PECL library: “Upgraded bundled PCRE to version 8.10.” [http://php.net/ChangeLog-5.php#5.3.4](http://php.net/ChangeLog-5.php#5.3.4). This appears to be the culprit. * I’d downgrade to 5.3.3 for now. I sent a note upstream to see if they know anything. * Cross-referencing [http://bugs.php.net/bug.php?id=53605](http://bugs.php.net/bug.php?id=53605). * [Andrew Nacin](https://wordpress.org/support/users/nacin/) * (@nacin) * [15 years, 4 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869151) * Which version of PCRE are you using? Is this the unbundled version? See what phpinfo() says about it. * [vbengeult](https://wordpress.org/support/users/vbengeult/) * (@vbengeult) * [15 years, 2 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869164) * I’m suddenly getting these kinds of errors too. Running WP 3.1.1 — it happens on my local server but not on GoDaddy. * Using PHP 5.3.6 PCRE version is Installed versions: 8.12(3)(11:52:32 AM 04/03/ 2011)(bzip2 cxx recursion-limit unicode zlib -static-libs) * There doesn’t seem to be any action on the bugs.php.net. Downgrading to PHP 5.3.3 is not an option. Any suggestions? Thanks in advance. * —————— * My Dashboard currently shows repeated errors where content should be under the headings: Plugins Wordpress Development Blog Other WordPress News * Warning: preg_match() [function.preg-match]: Compilation failed: unknown option bit(s) set at offset 0 in …/wp-includes/class-simplepie.php on line 11043 * and a single error on the Contact Us page: Warning: preg_replace() [function. preg-replace]: Compilation failed: unknown option bit(s) set at offset 0 in …/ wp-includes/shortcodes.php on line 228 Viewing 14 replies - 1 through 14 (of 14 total) The topic ‘Warning: preg_match() [function.preg-match]: Errors’ is closed to new replies. * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/) * 14 replies * 5 participants * Last reply from: [vbengeult](https://wordpress.org/support/users/vbengeult/) * Last activity: [15 years, 2 months ago](https://wordpress.org/support/topic/warning-preg_match-functionpreg-match-errors/#post-1869164) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics