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run code in 150+ php & hhvm versions
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<?php $re = iconv("utf-8", "cp1251", "/-[а-я]+=/"); $rei = iconv("utf-8", "cp1251", "/-[а-я]+=/i"); $RE = iconv("utf-8", "cp1251", "/-[а-яА-Я]+=/"); $str = iconv("utf-8", "cp1251", "-Превед="); var_dump($str); var_dump(mb_detect_encoding($str)); var_dump($re, preg_match($re, $str)); var_dump($rei, preg_match($rei, $str)); var_dump($RE, preg_match($RE, $str));
based on IoQnq
Output for 5.0.0 - 5.5.34, 5.6.7 - 5.6.20, 5.6.28, hhvm-3.12.0, 7.0.0 - 7.0.5, 7.0.14 - 7.1.0
string(8) "-������=" string(5) "UTF-8" string(10) "/-[�-�]+=/" int(0) string(11) "/-[�-�]+=/i" int(0) string(13) "/-[�-��-�]+=/" int(1)
Output for 7.0.6
Fatal error: Uncaught Error: Call to undefined function iconv() in /in/adtqt:2 Stack trace: #0 {main} thrown in /in/adtqt on line 2
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.5.35, 5.6.21
Fatal error: Call to undefined function iconv() in /in/adtqt on line 2
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: iconv() in /in/adtqt on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: iconv() in /in/adtqt on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: iconv() in /in/adtqt on line 2