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I'm trying to check efficiently if a string matches any of an array of regexes and return true in the first encountered match (Breaking the iteration over the regexes)

My current code:

_.forEach(self._connectedClients, function(client) {
        if (client.authenticated) {
            var interested = _.forEach(client.interests, function(interest) {
                if (evt.event_type.search(interest) != -1) {
                    return true;
                }
            });
            if (interested) {
                self._sendJSON(client.socket, data);
            }
        }
    });

Interest is an array of regexes.

Any suggestions?

Thanks in advance

I'm trying to check efficiently if a string matches any of an array of regexes and return true in the first encountered match (Breaking the iteration over the regexes)

My current code:

_.forEach(self._connectedClients, function(client) {
        if (client.authenticated) {
            var interested = _.forEach(client.interests, function(interest) {
                if (evt.event_type.search(interest) != -1) {
                    return true;
                }
            });
            if (interested) {
                self._sendJSON(client.socket, data);
            }
        }
    });

Interest is an array of regexes.

Any suggestions?

Thanks in advance

  • javascript
  • arrays
  • regex
  • node.js
  • lodash
Share Improve this question edited Nov 10, 2015 at 18:00 Itay Weiss asked Nov 10, 2015 at 17:50 Itay WeissItay Weiss 6881 gold badge9 silver badges18 bronze badges 4
  • so, you want to have var regexes = [/a/,/b/,/c/] and var string = "teststring" and see which regexes match true? – Kristian Commented Nov 10, 2015 at 18:12
  • Wait, is client.interests or interest an array of regexes? – Felix Kling Commented Nov 10, 2015 at 18:18
  • @Kristian I don't really care which one matches I just wanna know if any of them matches. FelixKling The client.interests is the array of regexes. – Itay Weiss Commented Nov 10, 2015 at 18:20
  • Cool, then I'll stick with my answer submission. – Kristian Commented Nov 10, 2015 at 18:32
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3 Answers 3

Reset to default 4

You could use _.some, when the function passed returns a truthy value iteration will stop and true will be returned. If it can't find a truthy value it will return false, after iterating through the entire array.

Example: 

_.forEach(self._connectedClients, function(client) {
    if (client.authenticated) {
        if (_.some(client.interests, _.method('test', evt.event_type))) {
            self._sendJSON(client.socket, data);
        }
    }
});

Just use Array#some:

some() executes the callback function once for each element present in the array until it finds one where callback returns a true value. If such an element is found, some() immediately returns true. 

var interested = client.interests.some(function(regex) {
  return regex.test(evt.event_type);
});

Of course you can also use lodash's _.some implementation.

If I'm understanding you correctly, using plain javascript, you could do the following to check for matches of a single string over multiple regular expressions.

for(var i = 0; i<x.length; i++) {
  var regex = x[i]; console.log('regex', regex);
  if( str.match( x[i] ) ) {
    console.log("regex:",x[i]," matching: true");
  } else {
    console.log("regex:",x[i]," matching: false");
  }
}

However, if you meant something else, then do clarify. :)

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