javascript - regular expression for wildcard domain validation -

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I am new to writing regular expressions I am planning to write regular expressions to validate wildcard domain mailing . Here are the scenarios.

Correct:

  • *. Test.com
  • test.com
  • abc.test.com

    Wrong:

    • * Test Com
    • test.com *
    • test. Com
    • test.abc * .com

      My regular expression for the above secnario 

       [One-zA-Z0-9]) \ [+ A-zA-Z] {2,6} $ /   
       Is it working as expected? Do we have better expressions Can improve or write?   
       
       
        ^ (\ *.)? ([\ W -] + \.) + [\ W -] + $   
       matches your examples.  
       From my point of view, I also consider the third negative example correct.  
        ^ (([\ w -] + \.) | (\ *.)) + [\ W -] + $   
       < / P> 
       Edit: 
       You may have to customize the character squares to include the allowed characters. I wanted to keep Rizax easy to read

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