Fix escaping in JSON schema patterns #487
Merged
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The escaping logic for patterns in JSON schema got convoluted, and we introduced inadvertently inconcistencies in the formatting. Namely, we first unescaped all the characters before passing them into the parser for regular expressions. This unescaped characters later propagated and mixed with escaped characters when the expression was transpiled for UTF-16.
To solve this mess, we remove the unescaping step at the beginning and test more thouroughly to specify & observe the expected behavior.
Fixes #485.