![]() For more information, see v-mode character class. Specifically, the character class syntax is different and some characters can no longer appear literally. Some valid u-mode regexes become invalid in v-mode. The replace() method searches the original string for a regular expression (regex) pattern, and replaces any matches with a specified replacement string. The pattern is a string or regular expression ( RegExp ). For more information, see Complement classes and case-insensitive matching. It returns a new string with all matches of the pattern replaced by a replacement. The character class complement syntax constructs a complement class instead of negating the match result, avoiding some confusing behaviors with case-insensitive matching. 3 Answers Sorted by: 176 You need to double escape any RegExp characters (once for the slash in the string and once for the regexp): 'TESTONE TESTONE'.replace ( new RegExp ('\\TESTONE','gm'),'foo') Otherwise, it looks for the end of the line and 'TESTONE' (which it never finds).The character class syntax is upgraded to allow intersection, union, and subtraction syntaxes, as well as matching multiple Unicode characters.The \p escape sequence can be additionally used to match properties of strings, instead of just characters. The replaceAll () method returns a new string with all matches of a pattern replaced by a replacement.With the v flag, you get all features mentioned in the u flag description, plus: ("v" is the next letter after "u" in the alphabet.) Because u and v interpret the same regex in incompatible ways, using both flags results in a Syntaćrror. The v flag is an "upgrade" to the u flag that enables more Unicode-related features. has the value true if the v flag was used otherwise, false. ![]() Object.prototype._lookupSetter_() Deprecated. ![]() The replace() method returns a new string with the value(s) replaced. A number of special replacement patterns are supported see the Specifying a string as the replacement section of. If it's a string, it will replace the substring matched by the current regexp.
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