Javascript 将 PascalCase 转换为 underscore_case/snake_case

问题描述

如何将PascalCase 字符串转换为underscore_case/snake_case 字符串?我还需要将点转换为下划线.

How can I convert PascalCase string into underscore_case/snake_case string? I need to convert dots into underscores as well.

例如.转换

TypeOfData.AlphaBeta

进入

type_of_data_alpha_beta

推荐答案

您可以尝试以下步骤.

• 捕获所有大写字母并匹配前面的可选点字符.

• Capture all the uppercase letters and also match the preceding optional dot character.

然后将捕获的大写字母转换为小写字母，然后返回以_作为前导字符的replace函数.这将通过在替换部分中使用匿名函数来实现.

Then convert the captured uppercase letters to lowercase and then return back to replace function with an _ as preceding character. This will be achieved by using anonymous function in the replacement part.

这会将起始大写字母替换为 _ + lowercase_letter.

This would replace the starting uppercase letter to _ + lowercase_letter.

最后删除起始下划线将为您提供所需的输出.

Finally removing the starting underscore will give you the desired output.

var s = 'TypeOfData.AlphaBeta';
console.log(s.replace(/(?:^|\.?)([A-Z])/g, function (x,y){return "_" + y.toLowerCase()}).replace(/^_/, ""));

或

var s = 'TypeOfData.AlphaBeta';
alert(s.replace(/\.?([A-Z])/g, function (x,y){return "_" + y.toLowerCase()}).replace(/^_/, ""));

当整个单词都是大写时，任何阻止它的方法.例如.MotorRPM 变成 motor_rpm 而不是 motor_r_p_m?或者 BatteryAAA 变成 battery_aaa 而不是 battery_a_a_a?

var s = 'MotorRMP';
alert(s.replace(/\.?([A-Z]+)/g, function (x,y){return "_" + y.toLowerCase()}).replace(/^_/, ""));

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