Extracting Characters or Words Between 2 Symbols

Is there any way to extract text between 2 symbols? I have been told to use:

var email = "forename.surname@arco.co.uk";
document.write(email.substring(.,@));

Using substring seems to only work with t开发者_如何学Gohe position of the character and not symbols. I just want to extract the characters between the "." and "@"

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Sure, you can use regex:

var lastname = email.match(/[.]([^.]+)@/)[1]

Explanation:

[.]     # match dot literally
(       # open capture group
  [^.]+ # match anything other than a dot
)       # close capture group
@       # match @ character

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You could use RegExp:

var email = "forename.surname@arco.co.uk";
email.replace(/.+\.(.+)@.+/, '$1'); // surname

Or you could use substring:

email.substring(email.indexOf('.')+1, email.indexOf('@'))