Since 7c215fa (released with PCRE2 10.45), the compilation performance for any regular expression that refers to UCP properties took a deep dive as shown by:
$ ./pcre2test -t
PCRE2 version 10.44 2024-06-07 (8-bit)
re> /[\p{Nd}<>]+/
Compile time 1.0432 microseconds
data> <1>
Match time 0.1026 microseconds
0: <1>
PCRE2 version 10.48-DEV 2025-10-21 (8-bit)
re> /[\p{Nd}<>]+/
Compile time 2.4452 microseconds
data> <1>
Match time 0.0951 microseconds
0: <1>
a perf of the process shows that more than 70% of the CPU time is spent updating the classbits (_pcre2_update_classbits_8).
Note that there is also a similar degradation in regex that use UTF characters directly (from 53 to 126) for the query in testinput4:
/[^ABCDEFGHIJKLMNOPQRSTUVWXYZÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞĀĂĄĆĈĊČĎĐĒĔĖĘĚĜĞĠĢĤĦĨĪĬĮİIJĴĶĹĻĽĿŁŃŅŇŊŌŎŐŒŔŖŘŚŜŞŠŢŤŦŨŪŬŮŰŲŴŶŸŹŻŽƁƂƄƆƇƉƊƋƎƏƐƑƓƔƖƗƘƜƝƟƠƢƤƦƧƩƬƮƯƱƲƳƵƷƸƼDŽLJNJǍǏǑǓǕǗǙǛǞǠǢǤǦǨǪǬǮDZǴǶǷǸǺǼǾȀȂȄȆȈȊȌȎȐȒȔȖȘȚȜȞȠȢȤȦȨȪȬȮȰ
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Since 7c215fa (released with PCRE2 10.45), the compilation performance for any regular expression that refers to UCP properties took a deep dive as shown by:
a
perfof the process shows that more than 70% of the CPU time is spent updating the classbits (_pcre2_update_classbits_8).Note that there is also a similar degradation in regex that use UTF characters directly (from 53 to 126) for the query in testinput4: