There is a similar question (Javascript phone mask for text field with regex).

You can do it using regular expressions (see the code working at http://jsfiddle.net/BBeWN/45/):

var value = '1234567';

var formatted = value.replace(/^(d{3})(d{4}).*/, '$1-$2');

Notice that each part of the regular expression that is wrapped within parenthesis, (d{3}) and (d{4}) in the example above, can then be referenced to build the formatted text string using $1 and $2 respectively.

If you have N parts of the regular expression wrapped within parenthesis, you would be able to reference them to build a formatted text string with $1, $2, ..., $N respectively.

So, for the other format you mention ((000) 000-0000), the code would be like this:

var formatted = value.replace(/^(d{3})(d{3})(d{4}).*/, '($1) $2-$3');

You can find a great JavaScript regular expressions reference at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions