CODEWITHSUNDEEP
javascript
Daniel
Daniel

Reputation: 51

how to add more text to a string before a special char

I would like to modify a string using jQuery as following:

Existing value: myimage_one.png
New value: myimage_one_notold.png

How can I do it? Maybe with the concat() function?

Upvotes: 0

Views: 101

Answers (5)

Rory McCrossan
Rory McCrossan

Reputation: 337560

You can use the replace() function on your string. In this case you could replace the .png with _notold.png:

var foo = 'myimage_one.png';
var bar = foo.replace('.png', '_notold.png');
console.log(bar);

Alternatively, you can use this regular expression if you want to only remove the last instance of the ., in cases where the filename contains more than one:

var foo = 'myimage_one.png';
var bar = foo.replace(/\.([^\.]*)$/,'_notold.$1');
console.log(bar);

Also note that both of the above use native JS methods and havenothing to do with jQuery

Upvotes: 1

pd91
pd91

Reputation: 41

You can do the changes using the following method,

var existingVal = "myimage_one.png";
var modifiedVal = exisitingVal.replace(".","_notold.");

Upvotes: 0

Sami
Sami

Reputation: 3800

function replaceString(org_str,replace_with)
{   
var found_str = org_str.substring(org_str.lastIndexOf('.') + 1); 
return org_str.replace(found_str, replace_with);    
}

Upvotes: 1

SPViradiya
SPViradiya

Reputation: 117

Lets assume you have any series of letters, numbers, underscore or dash after the last dot in the file name, then:

filename = filename.replace(/(\.[\w\d_-]+)$/i, '_notold$1');

Upvotes: 0

messerbill
messerbill

Reputation: 5629

if you always want to append the string before the last . you can use split:

http://www.w3schools.com/jsref/jsref_split.asp

var strArr = existingVar.split('.');
var newString = "";
for (var i = 0; i < strArr.length; i++) {
    if (i+1 < strArr.length) {
    newString += strArr[i];
    } else {
        newString += "_notOld"+ strArr[i+1];     
    }
}
alert(newString);

this should do the job in every case, with each filetype and name (for example: my.new.file.is.cool.jpg should work as well as myFile.png or myImage.yeah.gif)

Upvotes: 0

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