To help improve WAF default performance and overall tunability:

  • The default PCRE limit has been raised from 1,000 to 10,000.
  • The upper limit on the PCRE value has been extended from 99,999 to 9,999,999.

The default setting is the recommended initial value but can be tuned if necessary to provide the required depth of WAF analysis. Setting this limit higher than the default should be done only after a determination has been made that a higher WAF engine iteration depth is required for the configuration.