I experimented with various patterns in an attempt to detect the B button by itself, but the patterns were unsuccessful as they also detected RB and LB.
I tried different variations:
/B(?!^LB$|^RB$)/g
/^B$|^B,$|^ B,$/g
/^B$|^B,$|^ B,$(?!^LB$|^RB$)/g
The goal is to have a pattern that can identify B on its own or followed by a comma and/or space.
^ and $ serve as anchors for the search, marking the beginning and end of the input string. This is why (?!^LB$|^RB$) will never evaluate to true in your regular expressions.
To address this issue, you may consider utilizing word boundary anchors:
/\bB\b/
This pattern will match B only if there are no adjacent letters (or digits/underscore) present.
If you also want to ensure that an actual space or comma precede or follow your B, then you can use:
/[ ,]B\b|\bB[ ,]/
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