Fabian Homborg 864bb1f7a6 Add string-replace-fewer-backslashes feature ...

This disables an extra round of escaping in the `string replace -r`
replacement string.

Currently, to add a backslash to an a or b (to "escape" it):

    string replace -ra '([ab])' '\\\\\\\$1' a

7 backslashes!

This removes one of the layers, so now 3 or 4 works (each one escaped
for the single-quotes, so pcre receives two, which it reads as one literal):

    string replace -ra '([ab])' '\\\\$1' a

This is backwards-incompatible as replacement strings will change
meaning, so we put it behind a feature flag.

The name is kinda crappy, though.

Fixes #5474.

2019-03-15 15:18:19 +01:00

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