Hyphen and underscore not compatible in sed

Question

I\'m having trouble getting sed to recognize both hyphen and underscore in its pattern string.

Does anyone know why

[a-z|A-Z|0-9|\\-|_]

Answer 1

You don't need to use | symbol in a regex character class to separate the characters. Perhaps try something like this ...

[a-zA-Z0-9\-_]