JavaScript正则表达式在字符串中间查找单词。

I'm trying to pull the name "Dave" (but it will be different depending on who is logged in) out of the following string:

我想把“Dave”这个名字从下面的字符串中拉出来(但这取决于谁登录了):

Logged In: Dave - example.com

Any thoughts on the best way to do this with regex in JS?

对于在JS中使用regex的最佳方式有什么想法吗?

3 个解决方案

#1

I don't know how you have things exactly, setup, but this should work:

我不知道你是怎么做到的，设置，但这应该是可行的:

// This is our RegEx pattern.
var user_pattern = /Logged In: ([a-z]+) - example\.com/i

// This is the logged in string we'll be matching the pattern against
var logged_in_string = "Logged In: Dave - example.com"

// Now we attempt the actual match. If successful, user[1] will be the user's name.
var user = logged_in_string.match(user_pattern)

My example is lazy and only matches single names that contain letters between a-z because I wasn't sure of your parameters for the username. You can look up additional RegEx patterns depending on your needs.

我的示例是惰性的，只匹配包含a-z之间字母的单个名称，因为我不确定用户名的参数。您可以根据需要查找其他RegEx模式。

Hope this helps!

希望这可以帮助!

#2

You don't really need a regex. You could take a .slice() of the string, getting the position of the : and the - using .indexOf().

你真的不需要正则表达式。您可以使用字符串的.slice()来获得:和使用. indexof()的位置。

Example: http://jsfiddle.net/mkUzv/1/

例如:http://jsfiddle.net/mkUzv/1/

var str = "Logged In: Dave - example.com";

var name = str.slice( str.indexOf(': ') + 2, str.indexOf(' -') );

EDIT: As noted by @cHao, + 2 should have been used in order to eliminate the space after the :. Fixed.

编辑:如@cHao所言，应该使用+ 2来消除:后的空格。固定的。

#3

-1

split at the colon, split at the spaces, and take the second item in that array, like:

在冒号处分割，在空格处分割，取该数组中的第二个项，如:

var thestring = "Logged In: Dave - example.com";
thestring = thestring.split(":");
thestring = thestring[1].split(" ");
thename = thestring[1]

Or, if names could contain spaces:

或者，如果名称可以包含空格:

var thestring = "Logged In: Dave - example.com";
    thestring = thestring.split(":");
    thestring = thestring[1].split("-");
    var x = thestring[0].length;
    if (x > 4) { 
    var thename = thestring[0].replace(" ", "");
    }
    else {
    thestring = thestring[0].split(" ");
    thestring = thestring.split(" ");
    thename = thestring[1] + " " + thestring[3];
    }

#1