support for captures() in expandf()

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Issue #133 resolved
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I am doing a capture of repeating groups, for eventual substitution, and need the ability to reference specific captured values in substitutions and expansions (ie, expand/expandf).

Ideally, the format of the match expansion would be enhanced to differentiate between groups and captures, and within captures, specify an index, perhaps with a dot notation: Ie, {1.2} would match the second match of the first capture group.

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