How to Get Letter Only Using JavaScript

 step 1: open dilsecodie

 step 2: Goto Js section Letter Only regex

 step 3: get copy code in your function and get the result on a letter bypassing any word.

To get an only letter from the given string 

using jquery validator 

suppose to remove a number or any special char need to use

regex /^[a-zA-Z ]*$/; can allow only letter.

JavaScript was designed to add interactivity to HTML pages

JavaScript is a scripting language that reflects the object orientation of web pages.

It can be used for both client side & server side applications.

Client side java script is typically executed in a browser that supports the language.

It helps in the creation of HTML pages capable of responding to user events like mouse clicks, key presses, and selection of elements in the form.

Validation can be done on frontend (JavaScript) or on backend(php or any backend language) or both.

For example in an input box for mobile number you would not want alphabets since a mobile number is always a number. By using validation on frontend you avoid sending incorrect information to the server.

It would be /^_.*/

It will match any string that starts with underscore. Forgot to mention, it won't match newline inside the string.

To match a newline too in a string you can append a single line modifier and new regex will be /^_.*/s

"\" in a string, this depends on the quote you use,

 either single or double. If you’re making use of a double quote, 

escape characters can be used to do so as in the case below;

var x = "\"\\\""; 

console.log(x); 

The code snippet below will print “\” in the console.

Whereas, if it’s a single quoted string, you use  '"\\"';  simply.

^ % | & etc. That means that it is too a special character that can be escaped by \ 

I think the expression above matches a single character that is NOT present in

a-z

A-Z

the character "-"

whitespace

A x-y matches any character in the range from x to y, according to the collating order of the character encoding.

A x matches x.

A \ starts an escape sequence. There are two kinds of escape sequences: one that removes a special meaning from the following character, and one that imparts a special meaning to the following character. In the above example both are used: \- removes the character range meaning of -, so \- means "the character - itself"; the other case above is \s, which imparts a special meaning to s, which is "any character considered a spacing character".

And finally, any sequence of the above cases is just added together in a single character class

"One or more" is a common thing, so has a special symbol: “+”. You can replace “{1,}” with “+” in your regex without changing what it means.

Perhaps(?) the spaces aren’t actually in your regex, and you added them to make things clearer. In that case, your regex could be expressed as “[^.]+”, and would be “one or more non-periods.”

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