删除字符串的一部分，但仅当它位于字符串末尾

Remove a part of a string, but only when it is at the end of the string(删除字符串的一部分，但仅当它位于字符串末尾时)

问题描述

我需要删除字符串的子字符串，但前提是它位于字符串的末尾.

I need to remove a substring of a string, but only when it is at the END of the string.

例如，删除以下字符串末尾的 'string' :

for example, removing 'string' at the end of the following strings :

"this is a test string" ->  "this is a test "
"this string is a test string" - > "this string is a test "
"this string is a test" -> "this string is a test"

有什么想法吗?可能是某种 preg_replace，但如何??

Any idea's ? Probably some kind of preg_replace, but how??

推荐答案

您会注意到 $ 字符的使用，它表示字符串的结尾:

You'll note the use of the $ character, which denotes the end of a string:

$new_str = preg_replace('/string$/', '', $str);

如果字符串是用户提供的变量，最好先通过 preg_quote 运行它:

If the string is a user supplied variable, it is a good idea to run it through preg_quote first:

$remove = $_GET['remove']; // or whatever the case may be
$new_str = preg_replace('/'. preg_quote($remove, '/') . '$/', '', $str);

这篇关于删除字符串的一部分，但仅当它位于字符串末尾时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！