Issue with auto-correct feature and RegEx expressions.

[iamkobold]

I had the following line of code in ruby that removes numbers and punctuation from a string.

txt = txt.gsub(/[0-9.(),;:!?%#$?\x27\x22_+=\\\/\-]*/, '')

Which RuboCop's auto-correct feature changed it to this.

txt = txt.gsub(/[0-9.(),;:!?%#$CHILD_STATUS\'\"_+=\\\/-]*/, '')

I think that the matching logic was a bit too strong here especially with the $? converted to $CHILD_STATUS which in this context are no where near the same thing.

[bbatsov]

There's actually a subtle bug in your code as variable interpolation works in regular expression literals and for global variables like $? you can write only #$? as opposed to #{$?}. You should have also received a warning about the interpolation.

[bbatsov]

Hmm, there was a bug indeed - the cop that should have warned you about the interpolation didn't process regexp and backtick literals. This is corrected now.

[iamkobold]

Thanks @bbatsov I didn't realize RegEx expressions like that were also interpolated.