Javascript extract numbers from a string

Question

I want to extract numbers from a string in javascript like following :

if the string = 'make1to6' i would like to extract the numeric character before and after the 'to' substring in the entire string. i.e. 1 and 6 are to be extracted

The length of the string is not fixed and can be a max of 10 characters in length.The number can be of max two digits on either side of 'to' in the string.

Possible string values :

sure1to3
ic3to9ltd
anna1to6
joy1to4val
make6to12
ext12to36

thinking of something like :

function beforeTo(string) {
    return numeric_value_before_'to'_in_the_string;
}

function afterTo(string) {
    eturn numeric_value_after_'to'_in_the_string;
}

i will be using these returned values for some calculations.

Ry- · Accepted Answer · 2011-12-03 06:37:03Z

6

Here's an example function that will return an array representing the two numbers, or null if there wasn't a match:

function extractNumbers(str) {
    var m = /(\d+)to(\d+)/.exec(str);
    return m ? [+m[1], +m[2]] : null;
}

You can adapt that regular expression to suit your needs, say by making it case-insensitive: /(\d+)to(\d+)/i.exec(str).

answered Dec 3, 2011 at 6:37

Ry-♦

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1 Comment

Ry- Over a year ago

@Sandy505: Well, you recognize the regular expression, right? /(\d+)to(\d+)/. We'll start with that. \d means "any digit, from 0 to 9." \d+ means "at least one digit." to just matches the word "to." .exec executes the expression on the string, and turns it into an array of matches. So m[1] is the first group of digits, and m[2] is the second group of digits... we return those in an array if it matched. That's it. You can now access the first number as myArray[0] and the second as myArray[1].

jfriend00 · Accepted Answer · 2011-12-03 06:39:45Z

1

You can use a regular expression to find it:

var str = "sure1to3";
var matches = str.match(/(\d+)to(\d+)/);
if (matches) {
    // matches[1] = digits of first number
    // matches[2] = digits of second number
}

answered Dec 3, 2011 at 6:39

jfriend00

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