Here are some useful expressions:

1. match everything (including the character) before the character (e.g. hyphen):

^(.*?)\-

2. match everything (including the character) after the character (e.g. hyphen):

\-(.*)

3. match everything (excluding the character) before the character (e.g. hyphen):

.+?(?=\-)

4. match everything (excluding the character) after the character (e.g. hyphen):

(?<=-).*$