The C interface (posix interface?) for regexes has no "initialize"
function, only a free function. The comment in regcomp in
LibRegex/C/Regex.cpp notes that calling regcomp without a regfree is an
error, and will leak memory. Every single time regcomp is called on a
regex_t*, it will allocate new memory.
Make sure that all the regcomp calls are paired with a regfree in the
tests program
