CODEWITHSUNDEEP
javascriptregex
Sanmveg saini
Sanmveg saini

Reputation: 750

validation of javascript regular expression

I have the following string of javascript:

#d1{width:100px;} it looks like css code

now I wrote a regular expression that finds of an element starting with # or . in the string.

the regular expression is like this:

/(?:(#|\.)([A-Za-z0-1\-]+))/g

and the above regular expression matches successfully such strings like the above one.

but now when I tested this regular expression on the above string in Google console with then it returns false

the which I wrote was:

var str = "#d1{width:100px} " // returns undefined
var regex = / (?:(#|\.)([A-Za-z0-1\-]+)) /g //undefrined
regex.test(str) // returns false

Why it is not working?

Upvotes: 0

Views: 71

Answers (2)

Emre Acar
Emre Acar

Reputation: 920

Try this. These spaces between / and parantheses are jerks.

function regtest()
{
var str = "#d1{width:100px}" // returns undefined
var regex = /(?:(#|\.)([A-Za-z0-1\-]+))/g //undefrined
alert(regex.test(str));
}
<button onclick="regtest()">Test</button>

Upvotes: 1

lordvlad
lordvlad

Reputation: 5347

You have spaces in your regular expression which you propably don't want there:

var str = "#d1{width:100px} " // returns undefined
var regex = /(?:(#|\.)([A-Za-z0-1\-]+))/g //undefrined
//           ^-------------------------^----- see, no spaces here
regex.test(str) // returns true

Upvotes: 4

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