Regular expression for 6 digits OR 25 digits

I can write a regular expression to match ANY number of digits between 6 and 25 ...

^[[:digit:]]{6,25}$

but how would I write a regular expression to match either 6 digits or 25 digits, but no number in between?

^([[:digit:]]{6}|[[:digit:]]{25})$

(The regular expressions in this example are Tcl and PHP/ereg types. use \d instead of [[:digit:]] for PHP/preg and Perl.)

You may wonder why I want this. A client with 6 digit or 25 digit part numbers, a year number that can be 2 or 4 digits ...
(written 2008-04-16 19:06:00)

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  [1410] Tcl / regsub - changing a string and using interesting bits - (2007-10-27)
  [1305] Regular expressions made easy - building from components - (2007-08-16)

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