如何在某个字符最后一次出现后删除所有文本 [英] how to remove all text after the last recurrence of a certain character

问题描述

给定任何字符串，我想删除特定字符后的任何字母.

given any string, i want to remove any letters after a specific character.

这个字符可能在字符串中多次出现，我只想把它应用到最后一次出现.

this character may exist multiple times in the string and i only want to apply this to the last occurrance.

所以让我们说/"是字符，这里有一些例子:

so lets say "/" is the character, here are some examples:

http://www.ibm.com/test ==> http://www.ibm.com
你好/测试 ==> 你好

http://www.ibm.com/test ==> http://www.ibm.com
hello/test ==> hello

推荐答案

if (text.Contains('/'))
    text = text.Substring(0, text.LastIndexOf('/'));

或

var pos = text.LastIndexOf('/');
if (pos >= 0)
    text = text.Substring(0, pos);

(编辑以涵盖字符串中不存在/"的情况，如注释中所述)

(edited to cover the case when '/' does not exist in the string, as mentioned in comments)

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