What is the best way to replace multiple strings with bold formatting in JavaScript without losing the previous bolded text?

function boldKeywords(inputString, keywords){

    for (var i = 0; i < keywords.length; i++) {
                var key = keywords[i];
                if (key) inputString= inputString.replace(new RegExp(key, 'gi'), '<strong>' + key + '</strong>');
            }
            return s;
}

Using the JavaScript function above, I attempted to emphasize all occurrences of specific words in a given string based on a list of "keywords" or parts of strings.

For example:
keywords=["man", "str"] inputString="strong man"
Desired output:
strong man

However, the current output ends up replacing the instances of keywords within existing HTML tags as well. This results in

<strong>strstrong>ong man.
Is there a regular expression or alternative method that can be used to ignore HTML tags within a string and prevent this unexpected behavior?

javascriptstringstring-matching

Answer №1

To achieve this, consider defining a placeholder instead of directly utilizing <strong> tags:

function modifyText(inputString, keywords){
    var placeholder = '!!';
    var s = inputString.replace(new RegExp(/strong>/gi),placeholder);
    for (var i = 0; i < keywords.length; i++) {
                var t = keywords[i];
                if (t) s = s.replace(new RegExp(t, 'gi'), '<' + placeholder + t + '</' + placeholder );
            }
            return s.replace(new RegExp(placeholder,'g'),'strong>');
} 
modifyText("strong man",["man", "str"]);

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