Timothy Flynn e887314472 LibRegex: Fix ECMA-262 parsing of invalid identity escapes ...

* Only alphabetic (A-Z, a-z) characters may be escaped with \c. The loop
  currently parsing \c includes code points between the upper/lower case
  groups.
* In Unicode mode, all invalid identity escapes should cause a parser
  error, even in browser-extended mode.
* Avoid an infinite loop when parsing the pattern "\c" on its own.

2021-08-15 11:43:45 +01:00

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