如何删除字符串的第一个和最后一个字符

I'm wondering how to remove the first and last character of a string in Javascript.

我想知道如何删除Javascript中字符串的第一个和最后一个字符。

My url is showing /installers/ and I just want installers.

我的url显示/安装程序/我只想安装程序。

Sometimes it will be /installers/services/ and I just need installers/services.

有时是/安装程序/服务/我只需要安装程序/服务。

So I can't just simply strip the slashes /.

所以我不能简单地去掉斜线/。

9 个解决方案

#1

225

Here you go

在这里你去

var yourString = "/installers/";
var result = yourString.substring(1, yourString.length-1);

Or you can use .slice as suggested by Anka Gupta

或者你也可以像Anka Gupta建议的那样使用。slice

var result = yourString.slice(1, -1);

Documentation for the slice and substring.

切片和子字符串的文档。

#2

It may be nicer one to use slice like :

使用切片可能更好:

string.slice(1, -1)

#3

I don't think jQuery has anything to do with this. Anyway, try the following :

我认为jQuery与此无关。无论如何，试试下面的方法:

url = url.replace(/^\/|\/$/g, '');

#4

You could regex it:

你可以正则表达式:

"string".replace(/^\/?|\/?$/, "")
"/installers/services/".replace(/^\/?|\/?$/, "") // -> installers/services

The regex explained:
- Optional first slash: ^/?, escaped -> ^\/? (the ^ means beginning of string)
- The pipe ( | ) can be read as or
- Than the option slash at the end -> /?$, escaped -> \/?$ ( the $ means end of string)

正则表达式解释说:-可选的第一个削减:^ / ?,逃- > ^ \ / ?(^表示字符串的开始)-管道(|)可以读或比最后选择削减————> / ?美元,逃- > \ / ?$($表示字符串的结束)

Combined it would be ^/?|/$ without escaping. Optional first slash OR optional last slash

结合将是^ / ?| / $没有逃离。可选的第一个斜杠或可选的最后一个斜杠

#5

You can do something like that :

你可以这样做:

"/installers/services/".replace(/^\/+/g,'').replace(/\/+$/g,'')

This regex is a common way to have the same behaviour of the trim function used in many languages.

这个regex是一种具有许多语言中使用的trim函数的相同行为的常见方法。

A possible implementation of trim function is :

可能实现的修剪功能是:

function trim(string, char){
    if(!char) char = ' '; //space by default
    char = char.replace(/([()[{*+.$^\\|?])/g, '\\$1'); //escape char parameter if needed for regex syntax.
    var regex_1 = new RegExp("^" + char + "+", "g");
    var regex_2 = new RegExp(char + "+$", "g");
    return string.replace(regex_1, '').replace(regex_2, '');
}

Which will delete all / at the beginning and the end of the string. It handles cases like ///installers/services///

这将删除所有/在开始和结束的字符串。它处理///安装/服务///。

You can also simply do :

你也可以简单地做:

"/installers/".substring(1, string.length-1);

#6

You can use substring method

可以使用子字符串方法

s = s.substring(0, s.length - 1) //removes last character

another alternative is slice method

另一种选择是slice方法

#7

use .replace(/.*\/(\S+)\//img,"$1")

使用.replace(/ . * \ / \ / / img(\ S +),“$ 1”)

"/installers/services/".replace(/.*\/(\S+)\//img,"$1"); //--> services

"/services/".replace(/.*\/(\S+)\//img,"$1"); //--> services

#8

-1

The following regex will strip the first and last slashes if they exist,

下面的regex将删除第一个和最后一个斜杠，如果它们存在，

var result = "/installers/services/".match(/[^/].*[^/]/g)[0];

#9

-3

url=url.substring(1,url.Length-1);

This way you can use the directories if it is like .../.../.../... etc.

这样，如果目录是…/…/…等。

#1

225