I am trying to trim unicode spaces such as this character and I was able to do it using this solution. The problem with this solution is that it does not trim unicode spaces between normal characters. For example, this uses thin space
$string = " test string "; echo preg_replace('/^[pZpC]+|[pZpC]+$/u', '', $string); // outputs: test string
I know a little bit about regular expressions, so I don't know what to change my expression to solve this problem
P粉5579579702023-11-14 00:59:08
To remove all Unicode whitespace with control characters at the beginning and end of a string, and to remove all Unicode whitespace with control characters except regular spaces anywhere within the string, you can use
preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$|(?! )[\pZ\pC]/u', '', $string) // Or, simply preg_replace('/^\s+|\s+$|[^\S ]/u', '', $string)
See Regular Expression Demo #1 and Regular Expression Demo #2.
details
^[\pZ\pC]
- One or more spaces or control characters at the beginning of the string |
- or [\pZ\pC] $
- One or more spaces or control characters |
- or (?! )[\pZ\pC]
- One or more spaces or control characters other than regular spaces anywhere within the string [^\S ]
- Any whitespace except regular whitespace (\x20
) If you also need to "exclude" common newlines, replace (?! )[\pZ\pC]
with (?![ \r\n])[ \pZ \pC]
(suggested by @MonkeyZeus), in the second regex, this means you need to use [^\S \r\n]
.
View PHP Demo:
echo preg_replace('~^[\pZ\pC]+|[\pZ\pC]+$|(?! )[\pZ\pC]~u', '', 'abc def ghi '); // => abc defghi echo preg_replace('/^\s+|\s+$|[^\S ]/u', '', 'abc def ghi '); // => abc defghi
P粉4457509422023-11-14 00:22:00
How such Unicode spaces \u{2009} can cause problems in different places. So I would replace all unicode spaces with regular spaces and then apply trim().
$string = " test string and XY \t "; //\u{2009}\u{2009}\u{2009}test\u{2009}\u{2009}\u{2009}string\u{2009}and\x20XY\x20\x09\u{2009} $trimString = trim(preg_replace('/[\pZ\pC]/u', ' ', $string)); //test\x20\x20\x20string\x20and\x20XY
Note: The string in the comment is represented by debug::writeUni($string, $trimString);. Implemented from this class.