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run code in 150+ php & hhvm versions
Bugs & Features
<?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 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_replace(): Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 8 Warning: preg_replace(): Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 8 Warning: preg_replace(): Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 8 Warning: preg_replace(): Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 8 Array ( ) Warning: preg_replace(): Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 10
Output for 4.3.0 - 4.3.10, hhvm-3.10.0 - 3.12.0
Warning: Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 8 Warning: Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 8 Warning: Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 8 Warning: Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 8 Array ( ) Warning: Compilation failed: unrecognized character after (?< at offset 3 in /in/8Be4R on line 10