javascript - 如何简单地在正则表达式替换语句中传递变量？

Question

我有一个可变字符串短语，我想用变量中的内容删除字符串的开头，有或没有空格。

var fullphrase = "how can I trim this phrase?";
var cutthis = "how Can i";
var result = fullphrase.replace("/^cutthis ?/i","");

我希望结果为 = "trim this phrase?"

我怎样才能做到这一点？

Answer 1

为什么不将变量传递给替换参数？

var fullphrase = "how can I trim this phrase?";
var cutthis = "how Can i";
var result = fullphrase.replace(new RegExp("^" + cutthis + " ?", 'i'),"");