CODEWITHSUNDEEP
javascript
dazzle
dazzle

Reputation: 243

match exact string in a sentence

How to exactly match a given string in a sentence.

For example if the sentence is var sentence = "A Google wave is basically a document which captures a communication"

and the given string is var inputString= "Google Wave". I need to check the exact presence of Google Wave in the above sentence & return true or false.

I tried 

if(sentence.match(inputString)==null){
            alert("No such word combination found.");
        return false;
        }

This works even if someone enters "Google W". I need a way to find the exact match. Please help

Upvotes: 5

Views: 21549

Answers (3)

user1043000
user1043000

Reputation:

ContainsExactString2 was just me going more in-depth than necessary, '===' should work just fine

<input id="execute" type="button" value="Execute" />

// Contains Exact String

$(function() {
    var s = "HeyBro how are you doing today";
    var a = "Hey";
    var b = "HeyBro";
    $('#execute').bind('click', function(undefined) {
        ContainsExactString(s, a);
        ContainsExactString(s, b);
    });
});

function ContainsExactString2(sentence, compare) {
    var words = sentence.split(" ");
    for (var i = 0; i < words.length; ++i) {
        var word = words[i];
        var pos = 0;
        for (var j = 0; j < word.length; ++j) {
            if (word[j] !== compare[pos]) {
                console.log("breaking");
                break;
            }
            if ((j + 1) >= word.length) {
                alert("Word was found!!!");
                return;
            }++pos;
        }
    }
    alert("Word was not found");
}

function ContainsExactString(sentence, compare) {
    var words = sentence.split(" ");
    for (var i = 0; i < words.length; ++i) {
        if(words[i] === compare) {
            alert("found " + compare);
            break;
        }
    }
    alert("Could not find the word");
    break;
}

Upvotes: 0

Brad Christie
Brad Christie

Reputation: 101604

Using javascript's String.indexOf().

var str = "A Google wave is basically a document which captures a communication";
if (str.indexOf("Google Wave") !== -1){
  // found it
}

For your case-insensitive comparison, and to make it easier:

// makes any string have the function ".contains([search term[, make it insensitive]])"
// usage:
//   var str = "Hello, world!";
//   str.contains("hello") // false, it's case sensitive
//   str.contains("hello",true) // true, the "True" parameter makes it ignore case
String.prototype.contains = function(needle, insensitive){
  insensitive = insensitive || false;
  return (!insensitive ?
    this.indexOf(needle) !== -1 :
    this.toLowerCase().indexOf(needle.toLowerCase()) !== -1
  );
}

Oop, wrong doc reference. Was referencing array.indexOf

Upvotes: 7

Thomas Li
Thomas Li

Reputation: 3338

OP wants to return false when do search with Google W.

I think you should use word boundary for regular expression.

http://www.regular-expressions.info/wordboundaries.html

Sample:

inputString = "\\b" + inputString.replace(" ", "\\b \\b") + "\\b";
if(sentence.toLowerCase().match(inputString.toLowerCase())==null){
    alert("No such word combination found.");
}

Upvotes: 7

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