javascript - Match a list of strings using RegEx -


i have function highlights amount of single word in string in angularjs. want change highlights of words input in array instead, i'm not sure how word regexp. here current regexp:

$scope.highlight = function(haystack) {     return $sce.trustashtml(haystack.replace(new regexp(needle, "gi"), function(match) {         return '<span class="highlightword">' + match + '</span>';     })); };

the current "needle" variable plain string, 'cats', want change includes ['cats', 'registered', 'dog'] , on.

use join() method join array elements pipe | or operator in regex.

also, can use $& matched string , use in replace string.

$scope.highlight = function (haystack) {     return $sce.trustashtml(haystack.replace(new regexp(needle.join('|'), "gi"), '<span class="highlightword">$&</span>')); }; 

var arr = ['cat', 'dog', 'elephant'];  var str = 'cat fears dog , dog fears elephant';    document.body.innerhtml = str.replace(new regexp(arr.join('|'), 'gi'), '<span class="highlightword">$&</span>');
.highlightword {    background: yellow;  }

to match exact words, use word boundary \b.

str.replace(new regexp('\\b(' + arr.join('|') + ')\\b', 'gi'), '<span class="highlightword">$1</span>')

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