假设我们有以下字符串。其中之一以问号开头,即标点符号-
var sentence1 = 'My Name is John Smith.' var sentence2 = '? My Name is John Smith.'
我们需要检查以上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-
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");
要运行以上程序,您需要使用以下命令-
node fileName.js.
在这里,我的文件名为demo209.js。
输出结果
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