Fix regex and parse_format matchers

[Cadair]

Description

This fixes a regression in 0.15.

I decided to apply both the fixes, I can revert one or the other if people want.

Fixes #934

Status

READY

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

unit tests

Checklist:

• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #940 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #940   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          37     37           
  Lines        2346   2342    -4     
=====================================
- Hits         2346   2342    -4

Impacted Files	Coverage Δ
opsdroid/core.py	100% <ø> (ø)	⬆️
opsdroid/parsers/regex.py	100% <100%> (ø)	⬆️
opsdroid/parsers/parseformat.py	100% <100%> (ø)	⬆️

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[FabioRosado]

I have tested these changes with my skill that generates images and uses regex group to get the details passed to opsdroid and everything worked fine 👍