变量名称


¥Variable Names

有效的变量名必须仅包含字母(大写或小写)、数字和下划线 (_),并且不能以数字开头。

¥A valid variable name must contain only letters (uppercase or lowercase), digits and underscores (_) and it can't begin with a digit.

更具体地说,有效的变量名必须符合以下正则表达式:

¥More specifically a valid variable name must match the following regular expression:

^[a-zA-Z_]+[a-zA-Z0-9_]*$ 

建议的约定是必要时使用大写字母、下划线和数字,但任何符合上述定义的变量名都可以。

¥The recommended convention is to use capital letters with underscores and digits when necessary, but any variable name respecting the above definition will work just fine.

例如,以下是一些有效的变量名:MY_VARMY_VAR_1my_varmy_var_1myVarMy_Var123,但以下无效:1_VAR, 'my-var', "my var", VAR_#1.

¥For example, the following are some valid variable names: MY_VAR, MY_VAR_1, my_var, my_var_1, myVar, My_Var123, while these are instead not valid: 1_VAR, 'my-var', "my var", VAR_#1.