Menu
I know that I can pass a string as the second parameter to the JavaScript string object's replace method. In this case I can use $` and $' to reference the left/right part text of a successful match. Now my question is, If I pass a callback function as the second parameter, how can I get the same information? I want to use this infomation in the callback function. Great thanks.
484
The replace() method searches a string for a value or a regular expression. The replace() method returns a new string with the value(s) replaced. The replace() method does not change the original string.
3.1 The difference between replaceAll() and replace()If search argument is a string, replaceAll() replaces all occurrences of search with replaceWith , while replace() only the first occurence. If search argument is a non-global regular expression, then replaceAll() throws a TypeError exception.
replace() is an inbuilt method in JavaScript which is used to replace a part of the given string with some another string or a regular expression. The original string will remain unchanged. Parameters: Here the parameter A is regular expression and B is a string which will replace the content of the given string.
replace() The replace() method returns a new string with some or all matches of a pattern replaced by a replacement . The pattern can be a string or a RegExp , and the replacement can be a string or a function called for each match. If pattern is a string, only the first occurrence will be replaced.
See Mozilla's documentation; you won't get that data for free.
The good news is, you will get the offset of the match as your second-to-last argument, and the total string as the last. So you can run your own substring functions.
var str = 'abc';
str = str.replace('b', function (match, offset, full) {
var before = full.substr(0, offset),
after = full.substr(offset + 1, full.length - offset);
return 'foo'; // or, ya know, something actually using before and after
});
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
