I'm wondering how to remove the first and last character of a string in Javascript.
My url is showing /installers/
and I just want installers
.
Sometimes it will be /installers/services/
and I just need installers/services
.
So I can't just simply strip the slashes /
.
Here you go
var yourString = "/installers/"; var result = yourString.substring(1, yourString.length-1); console.log(result);
Or you can use .slice
as suggested by Ankit Gupta
var yourString = "/installers/services/"; var result = yourString.slice(1,-1); console.log(result);
使用slice
可能会更好:
string.slice(1, -1)
I don't think jQuery has anything to do with this. Anyway, try the following :
url = url.replace(/^\/|\/$/g, '');
If you dont always have a starting or trailing slash, you could regex it. While regexes are slower then simple replaces/slices, it has a bit more room for logic:
"/installers/services/".replace(/^\/?|\/?$/g, "")
# /installers/services/ -> installers/services
# /installers/services -> installers/services
# installers/services/ -> installers/services
The regex explained:
^
] + [Optional ?
] + [slash]: ^/?
, escaped -> ^\/?
or
$
] + [Optional ?
] + [slash] -> /?$
, escaped -> \/?$
Combined it would be ^/?|/$
without escaping. Optional first slash OR optional last slash.
Technically it isn't "optional", but "zero or one times".
You can do something like that :
"/installers/services/".replace(/^\/+/g,'').replace(/\/+$/g,'')
This regex is a common way to have the same behaviour of the trim
function used in many languages.
A possible implementation of trim function is :
function trim(string, char){
if(!char) char = ' '; //space by default
char = char.replace(/([()[{*+.$^\\|?])/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///
You can also simply do :
"/installers/".substring(1, string.length-1);
You can use substring
method
s = s.substring(0, s.length - 1) //removes last character
another alternative is slice
method
if you need to remove the first leter of string
string.slice(1, 0)
and for remove last letter
string.slice(0, -1)
use .replace(/.*\/(\S+)\//img,"$1")
"/installers/services/".replace(/.*\/(\S+)\//img,"$1"); //--> services
"/services/".replace(/.*\/(\S+)\//img,"$1"); //--> services
It is too nicer shortcode.
response.data.slice(1,-1) // "Prince"
-> Prince
以下正则表达式将删除第一个和最后一个斜杠(如果存在)
var result = "/installers/services/".match(/[^/].*[^/]/g)[0];
url=url.substring(1,url.Length-1);
这样,您可以使用目录,如果它像 .../.../.../... 等。
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