Regular expression in Javascript (without jQuery)?

Question

I am new to Javascript and recently I wanted to use regular expression in order to get a number from url and store it into a var as string and another var as digit. For example I want to get the number 55 from the below webpage (which is not an accrual page) and I want to store it in a var.

I tried this but it is not working

https://www.google.com/55.html
    url.replace(/(\d+)(\.html)$/, function(str, p1, p2) {
                    return((Number(p1) + 1) + p2);

Please I need help but not with jQuery because it does not make a lot of sense to me.

If you're trying to get a number, why are you calling replace? — Dave Newton
– Dave Newton, Commented Jan 21, 2012 at 22:37
Are you saying the number you want to retrieve will always be between the last / and .html? And you'll never have something like www.something.com/test55.html? — nnnnnn
– nnnnnn, Commented Jan 22, 2012 at 1:05

Dave Newton · Accepted Answer · 2012-01-21 23:31:04Z

1

var numPortion = url.match(/(\d+)\.html/)[1]

(Assumes a match; if it might not match, check the results before applying the array subscript.)

edited Jan 21, 2012 at 23:31

answered Jan 21, 2012 at 22:39

Dave Newton

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2 Comments

Dave Newton Over a year ago

@JoeTuskan I don't know what you're talking about.

Joe Over a year ago

Nice, I usually don't get to chuckle on SO!

Cornel Ghiban · Accepted Answer · 2012-01-21 22:41:59Z

0

Try this

var a="https://www.google.com/55.html";
var match = a.match(/(\d+)(\.html)/);

match is an array, match[0] contains the matched expression from your script, match[1] is the number (the 1st parenthesis), and so on

answered Jan 21, 2012 at 22:41

Cornel Ghiban

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6 Comments

Maan Sahir Over a year ago

I tried this :var a = location.href; var match = a.match(/(\d+)(\.html)/); <img src="Images/' +match+ '.jpg"> still it is not working

Cornel Ghiban Over a year ago

Perhaps I didn't give my array a good name. Try this: <img src="Images/' +match[1] + '.jpg">

Maan Sahir Over a year ago

does it matter if it is a string or a digit ?

Cornel Ghiban Over a year ago

no, but the 1st group of () is looking for a number, so in match[1] you'll have something that looks like a number. If the url is not of this format (<number>.html), than the regular expression doesn't match and aout array, match, will be null.

Maan Sahir Over a year ago

Now I have this <script>var a = location.href; var match = a.match(/(\d+)(\.html)/); </script> <img src="Images/' +match[1] + '.jpg"> but I do not know why it is not working ?

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jermel · Accepted Answer · 2012-01-21 23:09:17Z

0

var url = 'http://www.google.com/55.html';
var yournumber = /(\d+)(\.html)$/.exec(url);
yournumber = yournumber && yournumber[1];  // <-- shortcut for using if else

answered Jan 21, 2012 at 23:09

jermel

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