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<?php $var = array( '#tag', 'text #tag text', 'text #tag', 'text#tag', ); $res = preg_replace('/(?<\s)#\S{1,24}+/u', '<$0>' , $var); print_r($res); echo preg_replace('/(?<\s)#\S{1,24}+/u', '<$0>' , '#111 тапинамбур#222 #333 #444');
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Compilation failed: subpattern name expected at offset 3 in /in/8Be4R on line 8 Warning: preg_replace(): Compilation failed: subpattern name expected at offset 3 in /in/8Be4R on line 8 Warning: preg_replace(): Compilation failed: subpattern name expected at offset 3 in /in/8Be4R on line 8 Warning: preg_replace(): Compilation failed: subpattern name expected at offset 3 in /in/8Be4R on line 8 Array ( ) Warning: preg_replace(): Compilation failed: subpattern name expected at offset 3 in /in/8Be4R on line 10

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