Created
June 21, 2010 22:52
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#!/usr/bin/env perl | |
$field =~ | |
m/^( | |
[\x09\x0A\x0D\x20-\x7E] # ASCII | |
| [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte | |
| \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs | |
| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte | |
| \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates | |
| \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3 | |
| [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15 | |
| \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16 | |
)*$/x; |
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