Check if string contains only alphabets

Given a string, check if the string contains only alphabets, using JavaScript.

Solution

To check if given string str contains only alphabets using JavaScript, call match() method on the given string and pass a regular expression that matches one or more alphabets (upper or lower case) /^[A-Za-z]+$/ as argument to the method.

str.match(/^[A-Za-z]+$/)

The match() method returns true if the given string str contains only alphabets, or false otherwise. We can use this expression as a condition in if-else statement.

Programs

1. Given a string str. Check if this string contains only alphabets.

var str = 'HelloWorld';
if ( str.match(/^[A-Za-z]+$/) ) {
    console.log('string contains only alphabets');
} else {
    console.log('string does not contain only alphabets');
}

Since the string contains only alphabets, if-block must run.

2. Given a string str. This string does contain some digits also. Check programmatically if this string contains only alphabets.

var str = 'HelloWorld123';
if ( str.match(/^[A-Za-z]+$/) ) {
    console.log('string contains only alphabets');
} else {
    console.log('string does not contain only alphabets');
}

Since the string does not contain only alphabets, else-block must run.