javascript包含（）不区分大小写 [英] javascript includes() case insensitive

问题描述

假设我有一个过滤字符串数组，我需要循环并检查其他传入的字符串。

lets say I have an array of filter strings that I need to loop and check against with other passed in string.

var filterstrings = ['firststring','secondstring','thridstring'];
var passedinstring = localStorage.getItem("passedinstring");

for (i = 0; i < filterstrings.lines.length; i++) {
    if (passedinstring.includes(filterstrings[i])) {
        alert("string detected");
    }
}

如何确保在此处忽略区分大小写（最好通过使用正则表达式）过滤时，如果 var passinstring 的字符串如 FirsTsTriNg 或 fiRSTStrING ？

How do I ensure that case sensitivity is ignored here (preferably by using regex) when filtering, if the var passedinstring were to have strings like FirsTsTriNg or fiRSTStrING?

推荐答案

您可以从<$创建 RegExp c $ c> filterstrings first

You can create a RegExp from filterstrings first

var filterstrings = ['firststring','secondstring','thridstring'];
var regex = new RegExp( filterstrings.join( "|" ), "i");

然后测试如果 passedinstring 是否

var isAvailable = regex.test( passedinstring ); 

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