Question

How to check if a string contain only letters and digits with preg_match in PHP

Answer 1

$s = "c++14@vb.net&%java*() php <>/python 3.7.3"; 

if (preg_match("/^[a-zA-Z0-9]+$/", $s) == 1) {
    echo "true";
}
else {
   echo "false"; 
}
      
 
  
    
/*
run:
         
false
  
*/

 

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Answer 2

$s = "php7python3"; 

if (preg_match("/^[a-zA-Z0-9]+$/", $s) == 1) {
    echo "true";
}
else {
   echo "false"; 
}
      
 
  
    
/*
run:
         
true
  
*/

 

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