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.

Answer 1

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).