Javascript：测试正则表达式并分配给变量，如果它在一行中匹配(Javascript: test regex and assign to variable if it matches in one line)

 要测试正则表达式是否匹配并将其分配给变量（如果不匹配），或者将其分配给某个默认值（如果不匹配），我目前正在执行以下操作： 
 
var test = someString.match(/some_regex/gi);
var result = (test) ? test[0] : 'default_value';
 
 我想知道是否有任何方法可以在JS中使用一行代码执行相同的操作。 
 
 澄清：我并不是想让我的代码更小，而是在我定义一些变量的地方使它更清晰： 
 
var foo = 'bar',
    foo2 = 'bar2',
    foo_regex = %I want just one line here to test and assign a regex evaluation result%

To test if a regex matches and assign it to a variable if it does, or assign it to some default value if it doesn't, I am currently doing the following:
 
var test = someString.match(/some_regex/gi);
var result = (test) ? test[0] : 'default_value';
 
I was wondering if there is any way to do the same thing in JS with one line of code.
 
Clarification: I am not trying to make my code smaller, but rather make it cleaner in places where I am defining a number of variables like so:
 
var foo = 'bar',
    foo2 = 'bar2',
    foo_regex = %I want just one line here to test and assign a regex evaluation result%

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