[Issue 23737] std.regex is slow to import and use

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23737

--- Comment #1 from Richard Cattermole <alphaglosined at gmail.com> ---
https://github.com/dlang/phobos/pull/8698

Only covers the removal of formattedWrite.

The problem with wordMatcher is that you actually want it to be memorized, so
this particular bit of code is correct and desirable even if it slows down
build times significantly, we may want improvements to CTFE engine instead as a
solution to it.

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