Javascript将PascalCase转换为underscore_case

How can I convert PascalCase string into underscore_case string? I need conversion of dots to underscore as well.

如何将PascalCase字符串转换为underscore_case字符串?我也需要将点转换为下划线。

eg. convert

TypeOfData.AlphaBeta

into

type_of_data_alpha_beta

5 个解决方案

#1

You could try the below steps.

您可以尝试以下步骤。

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

捕获所有大写字母,并匹配前面的可选点字符。
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.

然后将捕获的大写字母转换为小写,然后返回以使用_作为前一个字符替换函数。这将通过在替换部件中使用匿名功能来实现。
This would replace the starting uppercase letter to _ + lowercase_letter.

这会将起始大写字母替换为_ + lowercase_letter。

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

最后删除起始下划线将为您提供所需的输出。

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

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

any way to stop it for when a whole word is in uppercase. eg. MotorRPM into motor_rpm instead of motor_r_p_m? or BatteryAAA into battery_aaa instead of battery_a_a_a?

当整个单词都是大写时,任何阻止它的方法。例如。 MotorRPM进入motor_rpm而不是motor_r_p_m?或者BatteryAAA进入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(/^_/, ""));

#2

Alternatively using lodash:

或者使用lodash:

lodash.snakeCase(str);

Example:

_.snakeCase('TypeOfData.AlphaBeta');
// ➜ 'type_of_data_alpha_beta'

Lodash is a fine library to give shortcut to many everyday js tasks.There are many other similar string manipulation functions such as camelCase, kebabCase etc.

Lodash是一个很好的库,可以提供许多日常js任务的快捷方式。还有许多其他类似的字符串操作函数,如camelCase,kebabCase等。

#3

str.split(/(?=[A-Z])/).join('_').toLowerCase();

u're welcome

var s1 = 'someTextHere';
var s2 = 'SomeTextHere';

var o1 = s1.split(/(?=[A-Z])/).join('_').toLowerCase();
var o2 = s2.split(/(?=[A-Z])/).join('_').toLowerCase();

console.log(o1);
console.log(o2);

#4

This will get you pretty far: https://github.com/domchristie/humps

这将让你走得很远:https://github.com/domchristie/humps

You will probably have to use regex replace to replace the "." with an underscore.

您可能必须使用正则表达式替换来替换“。”用下划线。

#5

function toCamelCase(s) {
  // remove all characters that should not be in a variable name
  // as well underscores an numbers from the beginning of the string
  s = s.replace(/([^a-zA-Z0-9_\- ])|^[_0-9]+/g, "").trim().toLowerCase();

  // uppercase letters preceeded by a hyphen or a space
  s = s.replace(/([ -]+)([a-zA-Z0-9])/g, function(a,b,c) {
    return c.toUpperCase();
  });

  // uppercase letters following numbers
  s = s.replace(/([0-9]+)([a-zA-Z])/g, function(a,b,c) {
    return b + c.toUpperCase();
  });

  return s;
}

Try this function, hope it helps.

尝试这个功能,希望它有所帮助。

#1