CODEWITHSUNDEEP
javascriptjquerystring
user782104
user782104

Reputation: 13555

String manipulation in javascript (remove leading zero & specific character)

var patt = path.match(/P[0-9][0-9][0-9]/);
patt = patt.substr(1);  //Remove P

while(patt.charAt(0) === '0') {   //Remove 0
    patt = patt.substr(1);
}

alert(patt);

patt is fixed to this format: eg. P001 to P999

What I would like to do is very basic, just remove P and the leading 0 (if any). However, the code above is not working. Thanks for helping

Upvotes: 0

Views: 602

Answers (4)

Bruno
Bruno

Reputation: 6000

This seems the perfect use case for the global parseInt function.

parseInt(patt.substr(1), 10);

It takes as input the string you want to parse, and the base. The base is optional, but most people suggest to always explicitly set the base to avoid surprises which may happen in some edge case.

It stops to parse the string as soon as it encounters a not numerical value (blank spaces excluded). For this reason in the snippet above we're a passing the input string stripped of the first character, that as you've mentioned, is the letter "P".

Also, ES2015 introduced a parseInt function, as static method on the Number constructor.

Upvotes: 1

Prashant Kankhara
Prashant Kankhara

Reputation: 1588

Just a single line and you get what you want

var path = "P001"; //your code from P001 - P999

solution to remove P and the leading "0" . 

parseInt(path.substr(1), 10);

Thanks and Regards

Upvotes: 0

tom
tom

Reputation: 19173

If the input to this function is guaranteed to be valid (i.e. of the form P001...P999), then you can simply use the following to extract the integer:

parseInt(path.substr(1), 10)

Upvotes: 1

closure
closure

Reputation: 7452

Please use it like this:

var str = patt.join('');
str = str.replace(/P0*/, '');

Upvotes: 11

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