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<?php var_dump(preg_match_all('/#([\x{4e00}-\x{9fa5}\w]+)\b/u', '#中文 tag 1 #tag3', $r)); var_dump($r);
Output for 5.3.4 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(2) array(2) { [0]=> array(2) { [0]=> string(7) "#中文" [1]=> string(5) "#tag3" } [1]=> array(2) { [0]=> string(6) "中文" [1]=> string(4) "tag3" } }
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.3
int(1) array(2) { [0]=> array(1) { [0]=> string(5) "#tag3" } [1]=> array(1) { [0]=> string(4) "tag3" } }
Output for 4.3.0 - 4.3.2
Warning: Compilation failed: characters with values > 255 are not yet supported in classes at offset 10 in /in/70cuA on line 3 bool(false) array(0) { }

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