About JS string function String.replace()_Basic knowledge

Replace the substring(s) matching the given regular expression

string.replace(regexp, replacement)

Parameters:

regexp: RegExp object or string

replacement: A string of replacement text, or a function used to generate the corresponding replacement text when called.

Return:

Returns a replaced new string

Description:

replacement can be a string or a function. If it is a function, it will be called on each match and the string it returns will be used as the replacement text.

Parameters passed into the function:

1) String matching the pattern

2) A string matching a certain parenthesis subexpression in the pattern, which may be 0 or more such parameters

3) Integer, specifying the position in String where the matching result appears

4) string itself

Example:

Copy code The code is as follows:

//Make sure the case of the word "javascript" is correct
text.replace(/javascript/i, 'JavaScript');
//Replace all double quotes with pairs of leading and trailing single quotes
text.replace(/"([^"])" /g, "''$1''");
//Convert a single name from the format "Mack, Xu" to "Xu Mack"
name.replace(/(w )s*,s *(w )/, "$2 $1");
//Capitalize the first letters of all words in a string
text.replace(/bw b/g, function(word) {
return word.substring(0, 1).toUpperCase() word.substring(1);
});