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I try to use string
"/{foo}/{bar:[a-zA-Z0-9=\-\/]+}.{vzz}"
in Go.
When I use ", I see error:
unknown escape sequence
When I use ', I get:
cannot use '\u0000' (type rune) as type string in array or slice literal
unknown escape sequence
How I can use this regular expression for MUX in my Go application?
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When you mean \ character literally in string literals - it must be escaped additionally
"/{foo}/{bar:[a-zA-Z0-9=\\-\\/]+}.{vzz}"
otherwise you could use backticks instead of double quotes
`/{foo}/{bar:[a-zA-Z0-9=\-\/]+}.{vzz}`
According to Golang Language Specification.
string_lit = raw_string_lit | interpreted_string_lit .
raw_string_lit = "`" { unicode_char | newline } "`" .
interpreted_string_lit = `"` { unicode_value | byte_value } `"` .
So if you do not want to escape anything in your string literal, you need a raw one. and
The value of a raw string literal is the string composed of the uninterpreted (implicitly UTF-8-encoded) characters between the quotes
Golang does not use single quote ' as a string literal indicator. And your error with the double quote " is due to the compiler trying to escape \- and \/ as a part of the string before the regex interpreter.