SE-0354: Regex Literals

[tim1724 (Tim Buchheim)]

@hamishknight

The changes are twofold:

• When encountering a prefix operator containing / , we will not parse a regex literal if there is no closing / delimiter on the same line. This is the same behavior as with unapplied infix operators.
• The ) heuristic has been expanded such that the entire range of the regex literal is scanned for an unbalanced ) . If such a case is encountered, we will not parse a regex literal.

This is fantastic! Thank you for putting in so much effort to prevent breaking the use of / in custom operators.