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run code in 150+ php & hhvm versions
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<?php echo preg_replace('/.*?(?<columnname>`.+?`|\S+)\s*(?<operator>=|<|>|<>)\s*(?<value>`.+?`|\S+)/', '$1_$2', 'algo = asslgo AND caca=8');
Output for 4.4.6 - 4.4.9, 5.2.2 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
algo_=caca_=
Output for 4.3.11 - 4.4.5, 5.0.0 - 5.2.1
Warning: preg_replace(): Compilation failed: unrecognized character after (?< at offset 6 in /in/3vRjo on line 7
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unrecognized character after (?< at offset 6 in /in/3vRjo on line 7