javascript: verify the presence of uppercase and lowercase letters

Question

javascript: verify the presence of uppercase and lowercase letters

Can the validation of at least 2 lowercase and 2 uppercase letters be implemented when checking the case? Below is the condition I am currently using.

function HasMixedCase(passwd){
    if(passwd.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/))
        return true;
    else
        return false;
}

Example: http://jsfiddle.net/Ku4mg/

javascript validation

Answer 1

Answer №1

Revised to incorporate feedback from plalx's suggestion:

let m;
if( !(m = password.match(/[a-z]/g)) || m.length < 2) return false;
if( !(m = password.match(/[A-Z]/g)) || m.length < 2) return false;
return true;

Attempting to tackle everything in a single regex can lead to complications, often resulting in excessive backtracking.

Likewise, breaking down your code into smaller tasks enhances readability and comprehension.

Answer 2

Revised to incorporate feedback from plalx's suggestion:

let m;
if( !(m = password.match(/[a-z]/g)) || m.length < 2) return false;
if( !(m = password.match(/[A-Z]/g)) || m.length < 2) return false;
return true;

Attempting to tackle everything in a single regex can lead to complications, often resulting in excessive backtracking.

Likewise, breaking down your code into smaller tasks enhances readability and comprehension.

Answer 3

Answer №2

While @NietTheDarkAbsol's answer provides a valid approach, I recommend avoiding overcomplicating your functions. It's best to split the logic into separate, easier-to-maintain functions.

function analyzeTextCase(text) {
    return {
        uppercase: (text.match(/[a-z]/g) || []).length,
        lowercase: (text.match(/[A-Z]/g) || []).length
    };
}

function checkMixedCase(password) {
    var caseAnalysis = analyzeTextCase(password);

    return caseAnalysis.lowercase >= 2 && caseAnalysis.uppercase >= 2;
}

Answer 4

While @NietTheDarkAbsol's answer provides a valid approach, I recommend avoiding overcomplicating your functions. It's best to split the logic into separate, easier-to-maintain functions.

function analyzeTextCase(text) {
    return {
        uppercase: (text.match(/[a-z]/g) || []).length,
        lowercase: (text.match(/[A-Z]/g) || []).length
    };
}

function checkMixedCase(password) {
    var caseAnalysis = analyzeTextCase(password);

    return caseAnalysis.lowercase >= 2 && caseAnalysis.uppercase >= 2;
}

javascript: verify the presence of uppercase and lowercase letters

Answer №1

Answer №2

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