Unexpected control character(s) in regular expression: \x00.
1305}
1306
1307function nuAddSlashes (s) {
1308 return String(s).replace(/[\\"']/g, '\\$&').replace(/\u0000/g, '\\0')1309}
1310
1311function nuOpenTab (i) {Unexpected control character(s) in regular expression: \x1f, \x1f.
679
680 // CSS string/identifier serialization
681 // https://drafts.csswg.org/cssom/#common-serializing-idioms
682 const rcssescape = /([\0-\x1f\x7f]|^-?\d)|^-$|[^\0-\x1f\x7f-\uFFFF\w-]/g 683 const fcssescape = function (ch, asCodePoint) {
684 if (asCodePoint) {
685 // U+0000 NULL becomes U+FFFD REPLACEMENT CHARACTER
Description
Control characters are special, invisible characters in the ASCII range 0-31. These characters are rarely used in JavaScript strings, so a regular expression containing these characters is most likely a mistake.
Bad Practice
const pattern1 = /\x1f/;
const pattern2 = new RegExp("\x1f");
Recommended
const pattern1 = /\x20/;
const pattern2 = new RegExp("\x20");