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<?php $string = "fashion?utm_source=bingResult:èñïîëüçîâàíûäàííûåx_fields.txt;èñïîëü"; preg_match("/[\p{N}\p{L}]+/iu", $string, $splitTokens); var_dump($splitTokens);
based on d4CBd
Output for 4.4.0 - 4.4.9, 5.0.5 - 7.1.0
array(1) { [0]=> string(7) "fashion" }
Output for 4.3.11, 5.0.0 - 5.0.4
Warning: preg_match(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 2 in /in/cdPvb on line 3 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 2 in /in/cdPvb on line 3 array(0) { }