Support \\ in regex options parsing

[mortenlocka]

Wire strips a \ when parsing string options that are a regex. This makes the regex option invalid.

^([A-Z]{3}):([A-Za-z]+):([0-9ÆØÅæøåA-Za-z_\-]+)$

Gets parsed as:
^([A-Z]{3}):([A-Za-z]+):([0-9ÆØÅæøåA-Za-z_-]+)$

[seime]

Fixed