用JavaScript替换正则表达式的字符串 [英] Replacing strings with regex in JavaScript

问题描述

一个特别的正则表达式现在正在困扰我。我只想在字符串中替换 range = 100 ，如

A particular regular expression is bugging me right now. I simply want to replace the range=100 in a string like

var string = '...commonstringblabla<b>&range=100&</b>stringandsoon...';

with

...commonstringblabla<b>&range=400&</b>stringandsoon...

我成功匹配range = 100-part与

I successfully matched the "range=100"-part with

alert（string.match（/ range = 100 / ））;

alert( string.match(/range=100/) );

但是当我尝试更换它时，

But when I try to replace it,

string.replace（/ range = 100 /，'range = 400'）;

string.replace(/range=100/, 'range=400');

没有任何反应。该字符串仍然具有范围= 100。我怎样才能使它工作？

nothing happens. The string still has the range=100 in it. How can I make it work?

推荐答案

因为 replace 不会修改它所应用的字符串，但返回一个新字符串。

Because replace does not modify the string it is applied on, but returns a new string.

string = string.replace(/range=100/, 'range=400');

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