Java input validation with regular expression

I am trying to make sure the user can only enter numbers 0 - 100, can any of you Java geniuses give me a hint. My regex matches the inputs I want, but when I enter a '9' I encounter an error when I cast the string to a double. Actually the input value is never assigned to the perc variable, but only when the input is a single digit. Here' s the piece of code that's giving me this headache:
while(!in.hasNext("[0-9]")){
     try {
          perc = in.next("[0-9]{1,2}|100");
          break;
     } catch (InputMismatchException e) {
          System.out.println("Bad Input - Try Again");
          perc = in.next();
dblPerc = Double.parseDouble(perc);And here's the error:
Exception in thread "main" java.lang.NumberFormatException: empty String
        at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:994)
        at java.lang.Double.parseDouble(Double.java:510)
        at applicant_database.View.showInput(View.java:46)
        at applicant_database.View.main(View.java:101)

Add debugging code to your program to see what you're getting.

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quote:
Originally posted by:
Luckbox72
The problem is not the Regex. I have tested 3 or 4 different
versions that all work on the many different test sites. The
problem is it that the validation does not seem to work. I have
changed the patter to only allow NA and I can still type anything
into the text box. Is there some issue with useing Regex as your
validation?
Bear in mind that by default validation does not occur until
the user attempts to submit the form. If you are trying to control
the characters that the user can enter into the textbox, as opposed
to validating what they have entered, you will need to provide your
own javascript validation.

Password validation with regular expression

I'm trying to use a regular expression to validate a password. I've tried a number of different regex's that seem to work elsewhere but do not work in HTML DB. This includes a couple that I wrote and that I found on regex web sites. Specifically, I'm trying to validate that a string has:
1. at least one special character
2. at least one numeric character
3. no more than 6 consecutive characters
4. has a length between 8 and 14
Does anyone know why some regular expressions do not work in HTML DB that work elsewhere or has anyone done a regex similar to this in HTML DB.
Thanks!
- Brian

I see, I will use the [0-9] instead. The expression still does not work though. I simplified the expression down to try and figure out what doesn't work and it seems like it's the "?=".
1. I first entered the expression:
([:alnum:]*[0-9])
This expression just says there must be a number and it works fine in HTML DB.
2. I extended it to:
([:alnum:]*[0-9])([:alnum:]*[a-z])
This expression says that there must be a number followed by a letter. In this example "1a" works but "a1" does not.
3. To make it not care about the order I would normally add "?=" like so:
(?=[:alnum:]*[0-9])(?=[:alnum:]*[a-z])
This should work for "a1" or "1a" because the ? says the order doesn't matter. When I try this in HTML DB neither "1a" or "a1" work.
Any ideas?
Thanks
- Brian

Java validation with regular expression

Hi
I need to validate a string such that only numbers, alphabets, -, _, . is allowed and the below mentioned code works fine.
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I tried a space it does not work!!!Then you added the space between a character range or something.
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Help with regular expression needed

Hi,
Perhaps someone here can help me with my regular expression I'm trying to build in my Java code.
The regular expression that I'm looking to build consists of any non-whitespace character up until it finds one or two <>= symbols and then any character thereafter. So both these Strings would match the expression:
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Age>=18
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(\\S+)([><=]){1,2}(.+)However, group 1 always retrieves the first <>= symbol as in "City 1=". How can I make the <>= part greedy so that it retrieves both operator symbols?
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Make the first group, the non-spaces, reluctant:
"(\\S+?)([<>=]{1,2})(.+)"

ADF Email Validation using Regular Expression

Hi,
Wanted to add Email Validation VO search.
It is working if i put
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                                         messageDetailNoMatch="The value {1} is not a valid email address:"/>However this requires email id to be entered in Capital Letters.
Tried with below option is not working.
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Edited by: appsjit on Jan 25, 2013 7:08 PM

The RegEx to check EMail after RFC2822
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duplicate of Grouping & Back-references with regular expressions on Replace Text window

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Assistance with Regular Expression and Tcl
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I have a problem with regular expression. I want to validate that one word and second word are same. For that I have written a regex
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Ram wrote:
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Example:
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Java input validation with regular expression

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