0

我知道^and $，但我想删除字符串的最后一个空行，而不是每个。

$s = 'Foo

Bar

Baz
';

应该返回为

$s = 'Foo

Bar

Baz;

使用正则表达式如何在 PHP 中完成？

你可以在这里试试：http: //codepad.viper-7.com/p3muA9

4

3 回答 3

3 
<?php

$s = 'Foo

Bar

Baz
';

$s_replaced = preg_replace('//', '', $s);

$s_replaced = rtrim($s_replaced);
$out = '<textarea cols=30 rows=10>'.$s_replaced.'</textarea>';

echo $out;

?>

使用rtrim().

于 2012-05-05T10:47:27.967 回答
1

利用：

$s_replaced = preg_replace("/".PHP_EOL."$/", '', $s);
于 2012-05-05T10:48:14.750 回答
0

尝试这个：

查找：

(?s)\s+$

用。。。来代替：

none

解释：

<!--
(?s)\s+$

Options: case insensitive; ^ and $ match at line breaks

Match the remainder of the regex with the options: dot matches newline (s) «(?s)»
Match a single character that is a “whitespace character” (spaces, tabs, and line breaks) «\s+»
   Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Assert position at the end of a line (at the end of the string or before a line break character) «$»
-->
于 2012-05-05T10:48:39.047 回答