在 JavaScript 中检查字符串是否以标点符号开头
javascriptweb developmentobject oriented programming更新于 2025/10/29 23:40:17
假设我们有以下字符串。其中一个以问号开头，即标点符号 −
var sentence1 = 'My Name is John Smith.' var sentence2 = '? My Name is John Smith.'
我们需要检查上述两个句子中是否有任何一个以标点符号开头。要检查字符串是否以标点符号开头，代码如下−
示例
var punctuationDetailsRegularExpression=/^[.,:!?]/
var sentence1 = 'My Name is John Smith.'
var output1 = !!sentence1.match(punctuationDetailsRegularExpression)
if(output1==true)
console.log("This ("+sentence1+") starts with a punctuation");
else
console.log("This ("+sentence1+") does not starts with a punctuation");
var sentence2 = '? My Name is John Smith.'
var output2 = !!sentence2.match(punctuationDetailsRegularExpression)
if(output2==true)
console.log("This ( "+sentence2+") starts with a punctuation");
else
console.log("This ( "+sentence2+" ) does not starts with apunctuation");
要运行上述程序，您需要使用以下命令 −
node fileName.js.
这里的文件名是 demo209.js。
输出
这将产生以下输出 −
PS C:\Users\Amit\javascript-code> node demo209.js This (My Name is John Smith.) does not starts with a punctuation This ( ? My Name is John Smith.) starts with a punctuation
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有用资源
javascript 参考教程 - 该教程包含有关 javascript 的更多信息:https://www.cainiaomax.com/javascript/
