Wade, how many distinct patterns do you have in that table?  What's the
population distribution (in particular, do the top 32 patterns account
for most of the table)?

It's looking like the issue is not so much that the 7.3 code is
completely broken, as that its LRU replacement policy for precompiled
regex patterns got rejiggered in a way that doesn't match your data.

                        regards, tom lane

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