javascript 将字符串转换为正则表达式

Convert a string into a regular expression

提问by user2481168

I am using a very fine JavaScript library called "array-query"by Jacob Wright to do searches in arrays of objects.

我正在使用一个非常好的 JavaScript 库，它被 Jacob Wright称为“array-query”，用于在对象数组中进行搜索。

One method is regex()where a regular expression can be included in parentheses like this: regex(/[^\w\s]/). If I hardcode the expression as I just showed it works fine. If I put the same expression in a variable first it does not work, like this:

一种方法是regex()，其中一个正则表达式可被包括在这样的括号：regex(/[^\w\s]/)。如果我像刚才展示的那样对表达式进行硬编码，它就可以正常工作。如果我首先将相同的表达式放入变量中，则它不起作用，如下所示：

var reg = "/[^\w\s]/"; 
regex(reg);

I was told

有人告诉我

You are putting quotes around your regex, making it a string. Remove the quotes.

您在正则表达式周围加上引号，使其成为字符串。删除引号。

Thus

因此

var reg = /[^\w\s]/; 
regex(reg);

works fine.

工作正常。

Problem is I need to accept the user input from an textbox as part of the regular expression. For example if the user types in the letter zit needs to get changed to /z/. Even if I type in /z/the textbox.valuereturned has the same problem as a var reg = "/z/". If I hardcode var reg = /z/; regex(reg);it works fine.

问题是我需要接受来自文本框的用户输入作为正则表达式的一部分。例如，如果用户输入字母，z则需要将其更改为/z/. 即使我在键入/z/的textbox.value返回有同样的问题作为var reg = "/z/"。如果我硬编码var reg = /z/; regex(reg);它工作正常。

How to make a input textbox value of "z"into a form that is var reg = z;? Many many thanks for any help or ideas, hope this isn't too confusing.

如何将输入的文本框值"z"变成 的形式var reg = z;？非常感谢任何帮助或想法，希望这不会太混乱。

回答by Matyas

You should do

你应该做

var regex = new RegExp('your regex string');

Basically you can think of

基本上你可以想到

var regex = /pattern/modifiers;

as

作为

var regex = new RegExp(pattern,modifiers);

Read more about it at: MDNor w3schools

在以下位置阅读更多信息：MDN或w3schools

回答by Thelambofgoat

var reg = new RegExp("string");

回答by skparwal

You can do something like this:

你可以这样做：

var string = $('#input_id').val();
string = string.replace('/', '');

var regexpPattern = '/'+string+'/';
regex(regexpPattern);