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My string can be something like A01, B02, C03, possibly AA18 in the future as well. I thought I could use a regex to get just the letters and work on my regex since I haven't done much with it. I wrote this function:
function rowOffset(sequence) { console.log(sequence); var matches = /^[a-zA-Z]+$/.exec(sequence); console.log(matches); var letter = matches[0].toUpperCase(); return letter; } var x = "A01"; console.log(rowOffset(x)); My matches continue to be null. Am I doing this correctly? Looking at this post, I thought the regex was correct: Regular expression for only characters a-z, A-Z
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In order to verify that the string only contains letters, numbers, underscores and dashes, we can use the following regex: "^[A-Za-z0-9_-]*$".
To get a string contains only letters (both uppercase or lowercase) we use a regular expression (/^[A-Za-z]+$/) which allows only letters. Next the match() method of string object is used to match the said regular expression against the input value. Here is the complete web document.
You will use the given regular expression to validate user input to allow only alphanumeric characters. Alphanumeric characters are all the alphabets and numbers, i.e., letters A–Z, a–z, and digits 0–9.
You can use String#replace to remove all non letters from input string:
var r = 'AA18'.replace(/[^a-zA-Z]+/g, ''); //=> "AA" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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