Half-size check with regular expression

Half-size check with regular expression
Represent other than half-width characters in [^…] part.

$value = "こんにちは";

echo preg_match('/^[^ -~。-°\x00-\x1f\t]+$/u', $value);

[vagrant@localhost tests]$ ls
index.php
[vagrant@localhost tests]$ php -S 192.168.35.10:8000
PHP 7.1.21 Development Server started at Fri Feb 8 20:56:23 2019
Listening on http://192.168.35.10:8000
Document root is /home/vagrant/local/app/tests
Press Ctrl-C to quit.
[Fri Feb 8 20:56:31 2019] PHP Warning: preg_match(): Compilation failed: range out of order in character class at offset 11 in /home/vagrant/local/app/tests/index.php on line 5

なに？　修正します。

$value = "123";

if (preg_match('/^[^ -~｡-ﾟ\x00-\x1f\t]+$/u', $value)){
	echo "yes";
} else {
	echo "半角です";
}

/u
→　UTF-8 character code

OK