"gk" <srcjnu@gmail.com> wrote in news:1135682337.452055.265630
@g47g2000cwa.googlegroups.com:

You can use regular expressions.

use
class Pattern:
http://java.sun.com/j2se/1.5.0/docs/api/java/util/regex/Pattern.html
and class Matcher:
http://java.sun.com/j2se/1.5.0/docs/api/java/util/regex/Matcher.html

or String:matches(String regex)
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html#matches
(java.lang.String)

The javadoc for class Pattern shows how to construct regular expressions.

Basically you get the input string, match it against a regular expression,
and if it doesn't match, tell the user to try again.

Can you please spare a bit of time to explain YOUR problem. Where are
you gettign the data(input) from. What kind of user interface it is.
Where do you show the message. Do you want to strict the user to enter
only allowed format or you want to check the format after entry is done.

test
"gk" <srcjnu@gmail.com>
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