Function regex_literal::delimited::set_delimiter

pub fn set_delimiter(delimiter: &[u8]) -> bool

function set_delimiter customises delimiters for regex literal. The passed delimiter value (as a byte array) consists of 1 or upto 4 single-byte characters. It is firstly validated against DELIMITER_CHARS; and then is converted into u32 and stored in thread_local static DELIMITER and the function returns true if it is valid; otherwise DELIMITER is not updated and the function reuturns false.

A regular expression literal (reliteral) is enclosed by delimiters. A pair of forwardslashes – “/pattern_text/” originally from the matching operator in Perl¹, is used as the default delimiters in reliteral, which makes itself distinct from the other Rust literal expressions

Any delimiter sequence in the pattern text of reliteral is prepended with a backslash. To avoid using too many escaped backslashe, reliteral delimiter can be customised.

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