删除多余的空格,但不要删除两个单词之间

Question

我想删除字符串中的额外空格.我已经试过trim,ltrim,rtrim和其他人,但他们的工作是,甚至不尝试下面的东西.

//This removes all the spaces even the space between the words 
// which i want to be kept
$new_string = preg_replace('/\s/u', '', $old_string); 

这有什么解决方案吗？

更新:-

输入字符串: -

"
Hello Welcome
                             to India    "

输出字符串: -

"Hello Welcome to India"

Answer 1

$cleanStr = trim(preg_replace('/\s\s+/', ' ', str_replace("\n", " ", $str)));

Answer 2

好的,所以你想修剪 字符串末尾的所有空格和 单词之间多余的空格.

您可以使用单个正则表达式执行此操作:

$result = preg_replace('/^\s+|\s+$|\s+(?=\s)/', '', $subject);

说明:

^\s+      # Match whitespace at the start of the string
|         # or
\s+$      # Match whitespace at the end of the string
|         # or
\s+(?=\s) # Match whitespace if followed by another whitespace character

像这样(Python中的例子,因为我不使用PHP):

>>> re.sub(r"^\s+|\s+$|\s+(?=\s)", "", "  Hello\n   and  welcome to  India   ")
'Hello and welcome to India'

Answer 3

如果要删除字符串中的多个空格，可以使用以下命令：

$testStr = "                  Hello Welcome
                         to India    ";
$ro = trim(preg_replace('/\s+/', ' ', $testStr));