Handle Unicode codepoint escapes translate Regexp -> search
Handle Unicode codepoint escapes translate Regexp -> search

One of the differences between Ruby Regexp and the PCRE
flavor used in MongoDB is the syntax for Unicode escapes.
This translates the format used for Ruby Regexp,
`\uxxxx` (4 hex digits required), to `\x{xxx}` (where
"xxx" is up to 4 hex digits).

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