Uppercase and Lowercase with RegEx

Check if a string’s first letter is lowercase (^ checks beginning of input):

function hasLowerCase(str) {
    return (/^[a-z]/.test(str));
}

Check if a string’s first letter is uppercase:

function hasLowerCase(str) {
    return (/^[A-Z]/.test(str));
}

Check if a string contains lowercase anywhere:

function hasLowerCase(str) {
    return (/[a-z]/.test(str));
}
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Uppercase and Lowercase with RegEx

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