i'd like the code to quickly parse to grab all of the string until it the first left parenthesis.
judging from your example outcome you perhaps mean right bracket yes:
Try this - i have made your one-liner a multi-liner, btw., because it is easier to keep track of. You can convert it into a - quite unreadable - one-liner again, if you insist in unintelligible code. ;-)
Here is a version with commentary:
Notice that "sed -i" is a GNU-speciality and is not recommended to use. Instead write to a temporary file and move this over the original (once you are satisfied). sed -i does the same, but behind your back and in case something goes wrong you have less options to troubleshoot that.
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