Regex or jquery replace all string matches in another string

This question already has an answer here:

How do you use a variable in a regular expression? 16 answers

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使用RegExp()将搜索字符串转换为正则表达式

var searchedTerm = "test";
var returnedString = "National testing Plant testers";
var replacedString = returnedString.replace(new RegExp(searchedTerm, 'g'), '<span class="highlight">' + searchedTerm + '</span>');

document.write(replacedString);

.highlight {
  color: red;
}

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