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javascript - 如何使用正则表达式模式替换+91?

转载 作者:行者123 更新时间:2023-11-28 14:57:15 26 4
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https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_replace2获取

现在我想更改字符串中的+91。来自 https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_replace2

<!DOCTYPE html>
<html>
<body>

<p>Click the button to replace "blue" with "red" in the paragraph below:</p>

<p id="demo">Mr Blue has a blue house and a blue car.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
var str = document.getElementById("demo").innerHTML;
var res = str.replace(/blue/g, "red");
document.getElementById("demo").innerHTML = res;
}
</script>

</body>
</html>

让我们考虑以下字符串。

字符串:-嗨,我的号码是 +919090909090 和 +9190820209282 等等。

我想要的结果如下:嗨,我的号码是 +91 - 9090909090 和 +91 - 90820209282 等等。

但是当我使用正则表达式模式时,似乎在使用时出现错误str.replace(/blue/g, "red");

Invalid regular expression: /+91/: Nothing to repeat"

最佳答案

+ 符号是正则表达式中的特殊字符

Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy) (from regex101.com)

如果你想匹配字符串文字+,则需要对其进行转义:

/\+91/

将匹配。

像您希望的那样的示例替换是(再次来自 regex101.com )

const regex = /(\+91)/g;
const str = `+911147005555, +911147005556, +919999973703`;
const subst = `\$1 - `;

// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);

console.log('Substitution result: ', result);

关于javascript - 如何使用正则表达式模式替换+91?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42413906/

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