Function byteStringPatternBinaryRegex

A ByteStringPattern matching the bytes as a Latin-1 string against a regex — one character per byte, so \x00 names byte 0.

byteStringPatternBinaryRegex(/^\x00/)   // starts with byte 0x00
byteStringPatternBinaryRegex(/Hello/)   // contains ASCII "Hello"
byteStringPatternBinaryRegex(/^\d+$/)   // all ASCII digits
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