javascript javascript regexp替换 [英] javascript jquery regexp replace

问题描述

我正在尝试创建动态搜索栏，我需要帮助.

现在我正尝试用另一个字符串替换一个字符串，但我似乎无法成功.

我正在从用户那里得到输入:

var location_keyword = $("#si_user_location").val();

现在，我想用"|"替换空白"可以在我的正则表达式中将其用作OR.

例如，如果用户写了"Turkey Alanya"，我希望它是"Turkey | Alanya"，这样搜索就可以同时找到"Turkey"或"Alanya".

我尝试了类似的方法，但是没有用

var location_keyword = $("#si_user_location").val();
location_keyword.replace(" ","|");
var regexp_loc = new RegExp(location_keyword, "i");

我以前曾在PHP中使用以下表达式来实现此目的:

preg_replace('/'.preg_quote($keyword).'/i', "<span>$0</span>", $string)

并且我可以像这样替换字符串caseinsensetive，如何在js中做到这一点?

我使用了PHP中的最后一个表达式来突出显示结果中的关键字，我希望在js中也能做到这一点.

希望我能得到一些帮助，在此先感谢您！ :)

致以最诚挚的问候， 亚历山大

解决方案

使用 replace :

location_keyword.replace(" ","|");

• 它不修改字符串-它返回一个新字符串.您需要将调用结果重新分配给原始变量，否则您将看不到更改后的字符串.
• 除非您使用带有g(全局)标志的正则表达式，否则它仅替换第一次出现的情况.

尝试以下方法:

location_keyword = location_keyword.replace(/ /g, '|');

I'm trying to create a dynamic searchbar and i need help.

Right now im trying to replace a string with another string but i cant seem to succeed.

Im getting input from the user:

var location_keyword = $("#si_user_location").val();

Now i would like to replace a whitespace " " with a "|" to use this in my regexp as OR.

For example if the user wrote "Turkey Alanya", i want it to be "Turkey|Alanya" so that the search hits for both Turkey OR Alanya.

i tried something like this but it didnt work

var location_keyword = $("#si_user_location").val();
location_keyword.replace(" ","|");
var regexp_loc = new RegExp(location_keyword, "i");

i used to do this in PHP before with expressions such as:

preg_replace('/'.preg_quote($keyword).'/i', "<span>$0</span>", $string)

and i could replace strings caseinsensetive like this, how can i do this in js?

I used the last expression in PHP to highlight the keyword in the results, which i would like to do aswell in js.

hope i can get some help, thanks in advance! :)

best of regards, alexander

解决方案

There are two problems with the use of replace on this line:

location_keyword.replace(" ","|");

• It does not modify the string - it returns a new string. You need to reassign the result of the call to the original variable otherwise you won't see the changed string.
• It only replaces the first occurrence unless you use a regular expression with the g (global) flag.

Try this instead:

location_keyword = location_keyword.replace(/ /g, '|');

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