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  1. $pattern = "/^([0-9]+)$/";
  2.  
  3. if (preg_match($pattern, $input))
  4.    echo "yes";
  5. else
  6.    echo "nope";
Success #stdin #stdout 0.01s 13112KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/Ec3zh
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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