Vincent Demeester 4cbdb398d7 Allow custom pattern when extracting variable…
… as it is possible to do it when interpolating. It also fixes when
there is 2 variables on the same *value* (in the composefile, on the
same line)

Finaly, renaming the default, used in cli, pattern to `defaultPattern`
to not be shadowed unintentionally.

Signed-off-by: Vincent Demeester <vincent@sbr.pm>
Upstream-commit: 4c87725c35
Component: cli
2018-08-02 16:50:40 +02:00
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