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/**
* String literal syntax documentation from Ruby source (2.7.0-dev)
*
* Double-quote strings allow escaped characters such as <tt>\n</tt> for
* newline, <tt>\t</tt> for tab, etc. The full list of supported escape
* sequences are as follows:
*
* \a bell, ASCII 07h (BEL)
* \b backspace, ASCII 08h (BS)
* \t horizontal tab, ASCII 09h (TAB)
* \n newline (line feed), ASCII 0Ah (LF)
* \v vertical tab, ASCII 0Bh (VT)
* \f form feed, ASCII 0Ch (FF)
* \r carriage return, ASCII 0Dh (CR)
* \e escape, ASCII 1Bh (ESC)
* \s space, ASCII 20h (SPC)
* \\ backslash, \
* \nnn octal bit pattern, where nnn is 1-3 octal digits ([0-7])
* \xnn hexadecimal bit pattern, where nn is 1-2 hexadecimal digits ([0-9a-fA-F])
* \unnnn Unicode character, where nnnn is exactly 4 hexadecimal digits ([0-9a-fA-F])
* \u{nnnn ...} Unicode character(s), where each nnnn is 1-6 hexadecimal digits ([0-9a-fA-F])
* \cx or \C-x control character, where x is an ASCII printable character
* \M-x meta character, where x is an ASCII printable character
* \M-\C-x meta control character, where x is an ASCII printable character
* \M-\cx same as above
* \c\M-x same as above
* \c? or \C-? delete, ASCII 7Fh (DEL)
*
* In addition to disabling interpolation, single-quoted strings also disable all
* escape sequences except for the single-quote (<tt>\'</tt>) and backslash
* (<tt>\\\\</tt>).
*/
const patterns = [
"[abtnvfres\\\\]", // simple
"[0-7]{1,3}", // octal bits
"x[0-9a-fA-F]{1,2}", // hex bit
"u[0-9a-fA-F]{4}", // unicode char
"u\\{[0-9a-fA-F ]+\\}", // unicode chars
"c[ -~]|C\\-[ -~]", // control
"M\\-[ -~]", // meta
"M\\-\\\\C\\-[ -~]|M\\-\\\\c[ -~]|c\\\\M\\-[ -~]", // meta control
"c\\?|C\\-\\?" // delete
];
module.exports = new RegExp(`\\\\(${patterns.join("|")})`);
Version data entries
8 entries across 8 versions & 1 rubygems