Hi all,
It seems it is currently not possible to make reference to backreferences in
regexes:
<LocationMatch ~ ^/(foo|bar)/baz>
Something ${1}
</LocationMatch>
One of the tricky things to overcome to make this possible is that multiple
LocationMatch'es might match, which makes the traditional ${1} pattern tricky
to implement internally, as ${1} might be shadowed by another LocationMatch. As
a possible solution to this, we could pass explicit variable names after the
regex which are then populated into the subprocess environment and can be
referenced elsewhere:
<LocationMatch ~ ^/(foo|bar)/baz/(.*) MYPREFIX MYFILE>
Something ${MATCH_MYPREFIX}
SomethingElse ${MATCH_MYFILE}
</LocationMatch>
Naming the backreferences explicitly has the advantageous side effect that we
know how many of them there are (or we care about) and can pass or not pass the
correct sized array to ap_regexec() as needed, meaning that supporting
backreferences needs no performance penalty for people who don't use them.
Obviously the making the subprocess environment available to directives is a
separate issue.
Thoughts?
Regards,
Graham
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