Replay gain code

Support
4

Use one of the many regular expression online sites like

or

and you get:

1st Capturing Group (\\+|-)?
   ? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy)
   1st Alternative \\+
      \\+ matches the character \ literally (case sensitive)
        + Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
   2nd Alternative -
        - matches the character - literally (case sensitive)

\\ matches the character \ literally (case sensitive)
   s? matches the character s literally (case sensitive) 
   ? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy)

2nd Capturing Group (\\d*\\.\\d*)
   \\ matches the character \ literally (case sensitive)
      d* matches the character d literally (case sensitive)
       * Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
   \\ matches the character \ literally (case sensitive)
      . matches any character (except for line terminators)
   \\ matches the character \ literally (case sensitive)
      d* matches the character d literally (case sensitive)

\\ matches the character \ literally (case sensitive)
   sDB matches the characters sDB literally (case sensitive)

or

RegEx

Mp3tag is a tagging program. Not a "do-any-modification-to-my-music" application.
Further explanation for REPLAYGAIN Metadata.