[Bug 53387] SSI: Allow to use $1 to get result of regular expression matching

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=53387

--- Comment #2 from Mark Thomas <ma...@apache.org> ---
I've tested httpd and the behaviour is as follows:

Before any matches are attempted, $1 and friends are set to the empty string
After a successful match, $1 and friends remember the contents of the group
until the next match is attempted (not is successful)
After an unsuccessful match, $1 and friends are set to the empty string

At first glance, this looks fairly easy to implement.

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