regex - Regular expression remove the letters on the sides

Question

I can't find an expression which can remove all letters on both sides of a line.

Data sample:

Valencia 7x16/5x114.3 D71.6 ET48 Dark

I need to remove all letters on sides such as Valencia and Dark, so the output from previous string should be:

7x16/5x114.3 D71.6 ET48

I tried using the following expression but it didn't work:

[^x./ETD\s0-9] 

Answer 1

您在技术上不需要正则表达式：

$output = trim($input,"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ");

但这可能会更容易。

$output = preg_replace("/^\S+\s|\s\S+$/","",$input);

Answer 2

描述

该表达式将：

• 删除字符串开头或结尾处的所有字母，直到第一个空格字符

正则表达式：^[a-z]*\s|\s[a-z]*$

替换为：空字符串

例子

现场演示

示例文本

Valencia 7x16/5x114.3 D71.6 ET48 Dark

更换后

7x16/5x114.3 D71.6 ET48