PHP: remove extra space from a string using regex

问题

How do I remove extra spaces at the end of a string using regex (preg_replace)?

$string = "some random text with extra spaces at the end      ";

回答1:

There is no need of regex here and you can use rtrim for it, its cleaner and faster:

$str = rtrim($str);

But if you want a regex based solution you can use:

$str = preg_replace('/\s*$/','',$str);

The regex used is /\s*$/

• \s is short for any white space char, which includes space.
• * is the quantifier for zero or more
• $ is the end anchor

Basically we replace trailing whitespace characters with nothing (''), effectively deleting them.

回答2:

You don't really need regex here, you can use the rtrim() function.

$string = "some random text with extra spaces at the end      ";
$string = rtrim($string);

Code on ideone

---

See also :

• trim()
• ltrim()

回答3:

You can use rtrim

回答4:

You can use trim() to do this:

http://php.net/manual/en/function.trim.php

来源：https://stackoverflow.com/questions/3763439/php-remove-extra-space-from-a-string-using-regex