<?php $tokens = [ ':rr'=>5, ':tipo'=>'\[A-Z]' ]; $regex = '/#([a-zA-z0-9_]+)(:[a-zA-Z]+)/'; $pattern = '#nombre:tipo'; echo preg_replace($regex, "(?<$1>{$tokens[${2}]})", $pattern); /*echo preg_replace_callback($regex, function (array $matches) { $tokens = [ ':rr'=>5, ':tipo'=>'\[A-Z]' ]; echo "(?<{$matches[1]}>{$tokens[$matches[2]]})"; }, $pattern);*/
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