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_wp_can_use_pcre_u is private and should not be used in themes or plugins directly.
_wp_can_use_pcre_u › WordPress Function
Since4.2.2
Deprecatedn/a
› _wp_can_use_pcre_u ( $set = null )
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Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.
Related Functions: wp_create_user_request, wp_send_user_request, wp_create_user, wp_clean_update_cache, wpmu_create_user