如何使用Javascript将两部分填充的字符串拆分为两个变量？

Question

I have a string, userName , that looks something like this:

var userName = "CityOfLiverpool-----joesmith";
var userName = "Hull----------------janesmith";

The first part of userName is the Account: "CityOfLiverpool"

The second part of userName is the User: "joesmith"

The Account is always a maximum of 20 characters and is padded to the right with hyphens.

How can I extract the Account and the User?

Answer 1

Use a regexp with capture groups for the two parts that are separated by hyphens.

var match = userName.match(/^([^-]+)-+(.*)$/);
var firstName = match[1];
var lastName = match[2];

Answer 2

A simple way:

var parts = userName.split('-');
var firstPart = parts[0];
var lastPart = parts[parts.length - 1];

Answer 3

You can extract the Account and User with a regular expression :

userName.match(/^([^-]{1,20})-*(.*)$/)

The ^ matches the start of the string and $ matches the end. [^-] matches any character that is not a hyphen, and [^-]{1,20} matches anywhere between 1 and 20 such characters. -* matches zero or more hyphens. .* matches zero or more characters of any kind.

The whole regular expression breaks down as follows:

^             start of string
([^-]{1,20})  1 to 20 characters, each of which is not a hyphen
-*            zero or more hyphens
(.*)          zero or more characters of any kind
$             end of string

After doing

match = userName.match(/^([^-]{1,20})-*(.*)$/)

you can look up the first parenthesized group as match[1] and the second parenthesized group as match[2] .

 var userName = "Hull----------------janesmith"; var match = userName.match(/^([^-]{1,20})-*(.*)$/), account = match[1], user = match[2]; document.write('account = "'+account+'"<br />user = "'+user+'"'); 

Answer 4

Some of this solutions will not work if the user name contains hyphens or if the account is 20 characters long. This is an alternative based on the fact that the account is always 20 characters:

var account = userName.substr(0,20).replace(/-+$/, "");
var name = userName.substr(20, userName.length-20);