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  1. <?php
  2.  
  3. $str = "/hello/{:num}/{:str}/";
  4. $replace = [
  5. 	"num" => "[0-9]",
  6. 	"str" => "[a-zA-Z]"
  7. ];
  8. $str = preg_replace_callback(
  9. 		'/{:(.*)}/U',
  10. 		function ($matches) use ($replace) {
  11. 			if(isset($replace[$matches[1]])) {
  12. 				return $replace[$matches[1]];
  13. 			}
  14. 			else {
  15. 				return $matches[0];
  16. 			}
  17. 		},
  18. 		$str
  19. 	);
  20. echo $str;
Success #stdin #stdout 0s 82944KB
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Standard input is empty
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/hello/[0-9]/[a-zA-Z]/
https://ideone.com/6OT3Wl
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
secret

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