Regex filters for channel names and groups

[rodriguezst]

• Added regex filtering to choose only some groups of the M3U playlist (Example: only SPORTS and NEWS groups)
• Added regex filtering to choose only some channels (Example: only those including HD in the name)

docker-compose.yml:

 environment:
      GROUP_REGEX: 'SPORTS|NEWS'
      CHANNEL_REGEX: 'HD'

(Inspired on #57)

[pierre-emmanuelJ]

Thanks for your contribution 😄 I'll look it ASAP

[ridgarou]

Hi @pierre-emmanuelJ did you check this PR? I think this feature could be very useful 😄