Comment 4 for bug 1500235

New functionality implemented and tested.
Implementation based on https://developer.gnome.org/glib/stable/glib-Perl-compatible-regular-expressions.html, documentation of RE used available at https://developer.gnome.org/glib/stable/glib-regex-syntax.html.

Changed assignment management window layout (see screenshot).
File format version bumped to 1.2: patt attribute added to assignment definition (see attached example).

Compiled under linux without warnings and working as expected.
Tested:
- importing old file format
- saving and opening new xhb format
- adding, modifying assignment rules
- matching simple text with old method (substring search)
- matching using RE in transactions and splits