move regexp.MustCompile close to call

[alingse]

I'm validating an idea for my linter. I checked the top 2500 projects on github and found this.

All project result can be found here -> alingse/sundrylint#7

I think move the regexp.MustCompile out has two advantages

1. Performance benefits
2. Fail early with faulty regexp string

[ndyakov]

Hello @alingse thank you for the contribution. You are right that this may increase performance (if info modules is used often) and also will fail early if the regex is incorrect. At the same time time it introduces a global variable that can be changed from anywhere in the package. Since this method is not expected to be called that often I do not see the benefit outweighing the possible issues this may introduce. What I can suggest is to compile the regex only when used (i.e. if the section is modules) which will speed things a little.