boost/regex has huge header dependencies amounting to tens of thousands of
lines. This are now replicated in 167 translation units.
This patch converts like_matcher to use the pointer-to-implementation
idiom, which reduces the number of translations including boost/regex
to 28.
Since regular expressions are relatively expensive, and like_matcher is
relatively rare, the extra memory usage and run time will be
negligible.
Message-Id: <20200211170152.809554-1-avi@scylladb.com>
48b694df55