Racket pregexp syntax is currently missing the following:
#px"\\\\X" -> a single Unicode grapheme
#px"\\\\u[a-fA-F0-9]{4}" -> hexidecimal Unicode escapes
#px"\\\\u\\{[a-fA-F0-9]{1,4}\\}" -> hexidecimal Unicode escapes
#px"\\\\x[a-fA-F0-9]{2}" -> \x escapes
#px"\\\\n" -> newline
#px"\\\\r" -> linefeed
#px"\\\\t" -> tab
#px"\\\\a" -> \x07
#px"\\\\e" -> \x1B
#px"\\\\f" -> \x0C
#px"\\\\v" -> \x0B
In other words:
(regexp-match? "\n" "\n") -> #t
(regexp-match? "\\n" "\n") -> #f
(regexp-match? "\u00E0" "\u00E0") -> #t
(regexp-match? "\\u00E0" "\u00E0") -> #t
(regexp-match? "\\X" "\u00E0") -> #f
(regexp-match? "\\u{E0}" "\u00E0") -> #f
---
Most of the above is just adding in pregexp escape sequences for things that
already exist in Racket.
However, the \\X and \\u{E0} syntax are new.
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