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run code in 300+ PHP versions simultaneously
<?php $string = '[gallery columns="1" ids="137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161"]'; $pattern = '/\[(.*?)\]/i'; $replacement = '${1}1,$3'; echo preg_replace($pattern, $replacement, $string);
Output for git.master, git.master_jit, rfc.property-hooks
gallery columns="1" ids="137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161"1,

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