regular expression for getting @ and after that

Question

I am trying to create a regular expression for the string filtering. I want to get the symbol "@" and anything that is written after that and before a space.

Can someone help me with this?

For example:

hi I am @vaibhav .

The expected result this regular expression should give is vaibhav .

I made this:

/@[a-z]*/

However, I am not sure if this will confirm to the above mentioned criteria.

Answer 1

To get a substring from the @ up to the first space after it, use

@\S+

See demo

The \\S means a non-whitespace character .

If you do not need @ , use a capturing group:

@(\S+)

The value you need will be in Group 1. See another demo .

If you are using JavaScript:

 var re = /@(\\S+)/g; var str = 'hi I am @vaibhav . hi, and I am @strib .'; var m; while ((m = re.exec(str)) !== null) { document.write("The value is: <b>" + m[1] + "</b><br/>"); } 

Answer 2

The simplest solution is to use a negated set.

1. Search characters that are not '@'
2. Read in the '@'
3. Now capture characters that are not ' '

If you're trying to match and capture you can accomplish that like this:

[^@]*@([^ ]*).*

[ Live Example ]

If you only want to search then you don't need to match the whole string and you can just extract the actual match section:

@([^ ]*)

[ Live Example ]

The most complicated situation is where you need to deal with an escaped '@' . Here's an example of a match using that:

(?:[^\\@]|\\.)*@([^ ]*).*

[ Live Example ]

Answer 3

You can do that with lookarounds .

Edited version:

(?<=@)\w+

Demo on regex101