includes/common.inc:3488 contains a ?| modifer on a regex in a preg_replace call, which is not supported in PCRE 6.6. Rumor has it that upgrading to PCRE 7.6 fixes this problem. Drupal should catch the incompatibility sooner, either as a requirement or as a status report warning.

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bfroehle’s picture

bfroehle commented
Status: Active » Closed (duplicate)

Marking as a duplicate of #962318: Require PCRE Version >= 7.2, since there is more discussion of the problem there. Thanks for the report.