Regex for matching a character, but not when it’s enclosed in square bracket

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Assuming there are no nested square brackets, you can use the following to only match - characters that are outside of square brackets:

-(?![^\[]*\])

Example: http://regex101.com/r/sX5hZ2

This uses a negative lookahead, with the logic that if there is a closing square bracket before any opening square brackets, then the - that we tried to match is inside of brackets.

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