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

In my case, I wanted to replace a config setting that included a hyphen. Surrounding the setting in .* worked:

sed 's/.*some-service.*/some-service="new-value"/g' file

Also works when the config setting has an underscore.