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Now that our regex engine uses palloc(), it's not necessary to set up a special memory context callback to free compiled regexes. The regex has no resources other than the memory that is already going to be freed in bulk. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CA%2BhUKGK3PGKwcKqzoosamn36YW-fsuTdOPPF1i_rtEO%3DnEYKSg%40mail.gmail.com