fix lrc parse

[tumuyan]

1. I find that singleMatch.Groups[3].Value contains a dot, it should be singleMatch.Groups[4].Value

2. Considering the unregulated lyrics

   [00:55.14]line 1
   [00:55.14]line 2
   [00:55.14]line 3

[cqjjjzr]

As of 2., your version will drop lines after the second line.. Is it really intended? Consider concatenating the lines after 2nd line to the 2nd line maybe?

[tumuyan]

I've thought about what happens when there are more than three lines of lyrics at the same time. The most practical might be the original text, notes, and the translation:

[02:59.06]音楽(おんがく)にありがとう
[02:59.06]ongaku ni arigatou
[02:59.06]永远感谢　这段音乐的人生

But there doesn't seem to be any player that render all three lines at the same time, and also I haven't seen any lrc files like this.

If we concatenating the lines after 2nd line, It's not pretty or easy to read.