我们有一个字符串:
var dynamicString = "This isn't so dynamic, but it will be in real life.";
某些输入中的用户类型:
var userInput = "REAL";
我希望在此输入上进行匹配,并使用span来包装它以突出显示它:
var result = " ... but it will be in <span class='highlight'>real</span> life.";
所以我使用一些RegExp魔术来做到这一点:
// Escapes user input,
var searchString = userInput.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
// Now we make a regex that matches *all* instances
// and (most important point) is case-insensitive.
var searchRegex = new RegExp(searchString , 'ig');
// Now we highlight the matches on the dynamic string:
dynamicString = dynamicString.replace(reg, '<span class="highlight">' + userInput + '</span>');
这一切都很棒,除非是结果:
console.log(dynamicString);
// -> " ... but it will be in <span class='highlight'>REAL</span> life.";
我用用户的输入替换了内容,这意味着现在文本会使用户的内容不敏感。
如何用上面显示的范围包装所有匹配,同时保持匹配的原始值?
想通了,理想的结果是:
// user inputs 'REAL',
// We get:
console.log(dynamicString);
// -> " ... but it will be in <span class='highlight'>real</span> life.";
答案 0 :(得分:9)
您使用正则表达式捕获组和反向引用来捕获匹配并将其插入字符串
var searchRegex = new RegExp('('+userInput+')' , 'ig');
dynamicString = dynamicString.replace(searchRegex, '<span class="highlight">$1</span>');
答案 1 :(得分:0)
您也可以使用它而无需捕获组。
dynamicString = text.replace(new RegExp(userInput, 'ig'), '<span class="highlight">$&</span>');