删除字符串开头和结尾的空格 [英] Remove spaces from the beginning and end of a string

问题描述

我对正则表达式很陌生.我需要从开头和结尾的空格中清除搜索字符串.示例:搜索字符串"结果:搜索字符串"

I am pretty new to regular expressions. I need to clean up a search string from spaces at the beginning and the end. Example: " search string " Result: "search string"

我有一个可用作 javascript 解决方案的模式，但我无法使用 preg_replace 让它在 PHP 上运行:

I have a pattern that works as a javascript solution but I cant get it to work on PHP using preg_replace:

有效的 Javascript 模式:

Javascript patern that works:

/^[\s]*(.*?)[\s]*$/ig

我的例子:

$string = preg_replace( '/^[\s]*(.*?)[\s]*$/si', '', " search string " );
print $string; //returns nothing

解析时它告诉我无法识别 g，所以我不得不将其删除并将 ig 更改为 si.

On parse it tells me that g is not recognized so I had to remove it and change the ig to si.

推荐答案

如果只是空格，为什么不直接使用 trim()?

If it's only white-space, why not just use trim()?

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