Javascript RegExp - test Method issue

Question

I have an issue in implementing Javascript RegExp - test Method.

var array = ['facebook', 'twitter', 'linkedin', 'xing', 'weibo']

array .forEach(function(cns) {
    var connector_name = '/.*' + cns + '$/';
    console.log('conne name', connector_name);
    if (connector_name.test('facebook')) {
        con = {
            account_type: cns
        };
        console.log('cns', cns);
    }

});

it gives me uncaughtException *** [TypeError: Object /.*facebook$/ has no method 'test']. but when i give following way it works

if (/.*facebook$/.test('facebook')) {
con = {
    account_type: 'facebook'
    };
}

Please help me to fix this issue. Thank you.

laruiss · Accepted Answer · 2015-06-18 13:15:11Z

1

In your code:

var connector_name = '/.*' + cns + '$/';

There connector_name is a String, not a RegExp object. And String does not have the test() method.

But here:

if (/.*facebook$/.test('facebook')) {

/.*facebook$/ is a RegExp object, which has the test() method.

What you want to use is the RegExp constructor:

var array = ['facebook', 'twitter', 'linkedin', 'xing', 'weibo']

array .forEach(function(cns) {
    var connector_name = new RegExp('.*' + cns + '$');
    console.log('conne name', connector_name);
    if (connector_name.test(facebook)) {
        con = {
            account_type: cns
        };
        console.log('cns', cns);
    }

});

answered Jun 18, 2015 at 13:15

laruiss

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Rick Hitchcock · Accepted Answer · 2015-06-18 13:13:20Z

1

You can create a regular expression like this:

/regular expression/

… or like this:

new RegExp('regular expression')

You cannot create one using a string like this:

'/.*' + cns + '$/';

Snippet:

var array = ['facebook', 'twitter', 'linkedin', 'xing', 'weibo']

array .forEach(function(cns) {
  var connector_name = new RegExp('.*' + cns + '$');
  console.log('conne name', connector_name);
  if (connector_name.test('facebook')) {
    con = {
      account_type: cns
    };
    console.log('cns', cns);
  }
});

answered Jun 18, 2015 at 13:13

Rick Hitchcock

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