regex - Regular expression for 24-hour format in Perl -

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I have a scalar variable, I have some string value. I now want to write a pattern match that checks Whether the value is in the correct format or not. 

  my $ var = "2340";   
  Correct format   
  My $ var = "23:40";   
 I tried to do this but did not work for me:  
  / ^ (0 [1- 9] | 1 [012]) ( : [0 -5] \ d   
 Time format can be 00:00 (format will be 2 digits first: and then 2 digits :)   
 everything , Even under such circumstances They are very weird and it can understand a lot more to use something else.  
 In your case, off-the-counter code (some syntax errors may not have been tested):  
  if ($ var = ~ / (\ d \ d): (\ d \ d) /) {my $ hour = $ 1; my $ min = $ 2; if ($ hour & Gt; 23 || $ min> 59) {Print "Numbers Out of the Border!";} And {# Yes, Valid!}} {Print "Invalid Date Format!";}

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