Question 226236 in Javascript Question posted in
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Javascript – How to check how many matched regex in given string

I want to get how many time a regex matched in given string in JavaScript.

For example:

var string = "AABBCCaabbcc123!@#"

I want to get:

  • How many upper case in string: 6,
  • How many lower case in string: 6,
  • How many numbers in string: 3,
  • How many special characters in stirng: 3

Is there built-in js functions or simple way to implement this logic?

Thank you very much.

Tags:

2

Answers


  1. 0

    You can try the following way:

    function countCharacters(inputStr) {
    //uppercase letters
    var uCount = (inputStr.match(/[A-Z]/g) || []).length;
    
    //lowercase letters
    var lCount = (inputStr.match(/[a-z]/g) || []).length;
    
    //numbers
    var nCount = (inputStr.match(/d/g) || []).length;
    
    //special characters
    var sCount = (inputStr.match(/[!@#$%^&*()_+{}[]:;<>,.?~\-]/g) || []).length;
    
    //return an object containing the counts
    return {
        uppercase: uCount,
        lowercase: lCount,
        numbers: nCount,
        specialCharacters: sCount
    };
}

var str = "AABBCCaabbcc123!@#";
var counts = countCharacters(str);

console.log("Uppercase count:", counts.uppercase); //6
console.log("Lowercase count:", counts.lowercase); //6
console.log("Number count:", counts.numbers); //3
console.log("Special character count:", counts.specialCharacters); //3
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  2. 0

    You can have this in more shorter way.Just keep the pattern correct

     var string = "AABBCCaabbcc123!@#";

 var uppercaseCount = (string.match(/[A-Z]/g) || []).length;
 var lowercaseCount = (string.match(/[a-z]/g) || []).length;
 var numberCount = (string.match(/d/g) || []).length;
 var specialCharCount = (string.match(/[!@#$%^&*()_+{}[]:;<>,.?~\/-]/g) 
 || 
 []).length;

 console.log("How many upper case in string:", uppercaseCount);
 console.log("How many lower case in string:", lowercaseCount);
 console.log("How many numbers in string:", numberCount);
 console.log("How many special characters in string:", specialCharCount);
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