add group capture to replace

[cboseak]

Fixes #1760

Description

Per issue #1760's request, this is a feature to have Replace function support the group capture in the replacement string

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Important Notes

• In Rust's regex implementation, the replacement string syntax is custom and not identical to Perl or other languages that use backslash (\1, \2, etc.) for backreferences in replacement strings. Instead $1 $2 is valid for a group replace string.
  • \1 replace syntax was converted to $1 syntax to allow that

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Testing

• added tests
• all tests passing