Question

我找不到用以下条件写regexp的方法：

每个字只有一个大写字母 （不需要）（理想情况下，如果它是第一个字符）
其余字母必须小写

正确值的示例：

John Adam Ben
狗猫鹦鹉
夹心咖啡饼干
感受到差异

错误值的示例：

JOHN ADAM BEN
DoG cat PaRRoT
SANDWICH cofee Biscuit
费用difference

甚至可以编写上面处理的regexp吗？

提前致谢

Answer 1

你可以试试这个，

^(?:[A-Z][a-z]*|[a-z]+)(?:\s+(?:[A-Z][a-z]*|[a-z]+))*$

DEMO

＆＃13;

var arr = ["John Adam Ben", "Dog cat parrot", "sandwich coffee Biscuit", "feel the difference", "JOHN ADAM BEN", "DoG cat PaRRoT", "SANDWICH cofee Biscuit", "feeL the diFFerence"];

var regex = /^(?:[A-Z][a-z]*|[a-z]+)(?:\s+(?:[A-Z][a-z]*|[a-z]+))*$/g;

var result = {};
arr.forEach(function(str) {
    result[str] = regex.test(str);
    regex.lastIndex = 0;
});

console.log(result);
document.body.innerHTML = '<pre>' + JSON.stringify(result, 0, 4) + '</pre>';

＆＃13;

Answer 2

尝试使用if条件，逻辑非运算符!，RegExp /([A-Z])(?=[A-Z]+)/g匹配大写字母后跟大写字母RegExp.prototype.test()

if (!/([A-Z])(?=[A-Z]+)/g.test(str)) {
  // do stuff
}

<强>演示：

var arr = ["John Adam Ben", "Dog cat parrot", "sandwich coffee Biscuit", "feel the difference", "JOHN ADAM BEN", "DoG cat PaRRoT", "SANDWICH cofee Biscuit", "feeL the diFFerence"];

var regex = /([A-Z])(?=[A-Z]+)/g;

var result = {};
arr.forEach(function(str) {
    result[str] = !regex.test(str);
    regex.lastIndex = 0;
});

console.log(result);
document.body.innerHTML = '<pre>' + JSON.stringify(result, 0, 4) + '</pre>';

Answer 3

这个简单的正则表达式应该适合你：

/^(\b[a-z]*[A-Za-z][a-z]*\b\s*)+$/gm

RegEx Demo

var arr = ["John Adam Ben", "Dog cat parrot", "sandwich coffee Biscuit", "feel the difference", "JOHN ADAM BEN", "DoG cat PaRRoT", "SANDWICH cofee Biscuit", "feeL the diFFerence"];

var regex = /^(\b[a-z]*[A-Za-z][a-z]*\b\s*)+$/g;

var result = {};
arr.forEach(function(str) {
    result[str] = regex.test(str);
    regex.lastIndex = 0;
});

console.log(result);
document.body.innerHTML = '<pre>' + JSON.stringify(result, 0, 4) + '</pre>';

Answer 4

 $(document).ready(function () {

     var test = ["John Adam Ben",
                 "Dog cat parrot",
                 "sandwich coffee Biscuit",
                 "feel the difference",
                "JOHN ADAM BEN",
                "DoG cat PaRRoT",
                "SANDWICH cofee Biscuit",
                "feeL the diFFerence"
                    ];

     for (i = 0; i < test.length; i++) {
         if (/^(\b[a-z]*[A-Za-z][a-z]*\b\s*)+$/g.test(test[i])) {
             alert(test[i] + "   true")
         }
         else {
             alert(test[i] + "   false")
         }
     }

});

Answer 5

而不是找到这个：

每个单词只有一个大写字母（不是必需的）（理想情况下，如果是的话）第一个字符）
其余字母必须小写

您可以找到上述不正确的规则。这是：

[^b][A-Z]

您可以在此处测试：https://regex101.com/#javascript 它匹配这些字符串：

JOHN ADAM BEN
DoG cat PaRRoT
SANDWICH cofee Biscuit
费用difference

Javascript - Regexp每个单词一个大写字母

5 个答案: