ALPHA NUMERIC CHARACTERS EXAMPLES CODE

In the example below, we are invoking the validateString() function by passing the various strings as a parameter. I – It is a flag for the regular expression used for case-insensitive string comparison. + - It represents only characters between the a to z or 0 to 9. ^ - It represents the start of the string. In the above syntax, the result variable contains the boolean value based on whether the string is alphanumeric. Users can follow the syntax below to use the regular expression to validate the alphanumeric string. It is a pattern, and we can match the input string with a regular expression pattern, and based on that, it returns a true or false boolean value. We can create the regular expression using the RegExp() constructor with a new keyword. Output.innerHTML += 'The string ' + string + ' is an alphanumeric! ' If (!(charCode > 47 & charCode 96 & charCode 64 & charCode ' Let str2 = 'dfdrg rflrtke 435 3df fd'gfdg' Let str1 = 'aredsUADFSKH121342kjbrewdfv' Var output = document.getElementById('output') Using the for loop and charCodeAT() method to check if input string is alphanumeric or not If (!(charCode > 47 & charCode 96 & charCode 64 & charCode Users can follow the syntax below to use the charCodeAT() method to check whether the input string is alphanumeric.

So, if we find any character whose ASCII value is not between the above given ASCII range, we can say that string is not alphanumeric.

ALPHA NUMERIC CHARACTERS EXAMPLES CODE

The ASCII code between 48 to 57 is for numeric characters, 97 to 122 is for lowercase alphabetic characters, and 65 to 90 is for uppercase alphabetic characters. Here, we will iterate through every character of the string and check the ASCII value of every character. We can use the charCodeAT() method to get the ASCII value of any character. The alphanumeric string contains only numeric and alphabetical characters, including uppercase or lowercase characters, and even it doesn’t contain any special characters or spaces.īelow, we will see two approaches to validate an input string. We have been given the task of validating the input string and need to check whether it is alphanumeric or not using JavaScript.

Alpha numeric characters examples