Question

11

Replace last occurrence word in javascript

rated 0 times [ 12] [ 1] / answers: 1 / hits: 29591 / 10 Years ago, thu, april 17, 2014, 12:00:00

I have a problem with replacing last word in JS, I am still searching solution but i cannot get it.

I have this code:

var string = $(element).html(); // abc def abc xyz

var word   = abc;

var newWord = test;



var newV   = string.replace(new RegExp(word,'m'), newWord);

I want replace last word abc in this string, but now I can only replace all or first occurrence in string. How can I do this? Maybe is not good way?

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kourtney

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answered 10 Years ago annaw · Accepted Answer

Here is an idea ....

This is a case-sensitive string search version

var str = 'abc def abc xyz';

var word = 'abc';

var newWord = 'test';



// find the index of last time word was used

// please note lastIndexOf() is case sensitive

var n = str.lastIndexOf(word);



// slice the string in 2, one from the start to the lastIndexOf

// and then replace the word in the rest

str = str.slice(0, n) + str.slice(n).replace(word, newWord);

// result abc def test xyz

If you want a case-insensitive version, then the code has to be altered. Let me know and I can alter it for you. (PS. I am doing it so I will post it shortly)

Update: Here is a case-insensitive string search version

var str = 'abc def AbC xyz';

var word = 'abc';

var newWord = 'test';



// find the index of last time word was used

var n = str.toLowerCase().lastIndexOf(word.toLowerCase());



// slice the string in 2, one from the start to the lastIndexOf

// and then replace the word in the rest

var pat = new RegExp(word, 'i')

str = str.slice(0, n) + str.slice(n).replace(pat, newWord);

// result abc def test xyz

N.B. Above codes looks for a string. not whole word (ie with word boundaries in RegEx). If the string has to be a whole word, then it has to be reworked.

Update 2: Here is a case-insensitive whole word match version with RegEx

var str = 'abc def AbC abcde xyz';

var word = 'abc';

var newWord = 'test';



var pat = new RegExp('(\b' + word + '\b)(?!.*\b\1\b)', 'i');

str = str.replace(pat, newWord);

// result abc def test abcde xyz

Good luck
:)