JavaScript regular Verify Mailbox format analysis

Example

The code is as follows	Copy Code
function test () { var temp = document.getElementById ("Text1″"); Verification of e-mail var myreg =/^ ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+@ ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+\.[a-za-z]{2,3}$/; if (!myreg.test (Temp.value)) { Alert (' Prompt \ n \ nplease enter a valid e_mail! ’); Myreg.focus (); return false; } }

Example analysis, in the above code

/^ ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+@ ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+\.[a-za-z]{2,3}$/

Is the key sentence, according to the rules of our analysis

^ ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+ begins with a numeric character letter.

@ ([a-za-z0-9]+[_|\_|\.]?) There is a @ symbol in the middle of the *[a-za-z0-9]+\ and there are numbers or letters

. [A-za-z] {2,3} End of point this is mail like. com and so on. Oh.