Use of parenthesis in diffline regular expression
In case one is using litteral parenthesis in a diffline regular expression, backquoted or between square brackets, FilesParser wrongly think that the user has included parenthesis in the expression so to delimit the region of interest, and consequently it does not add default parenthesis so to select the whole line as region of interest. As a consequence, the selection of this "region of interest" always return "1" whatever the real content.
For the user, a fast and dirty way to avoid the problem is to add himself the parenthesis.
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