Solved

Regulal Expression to match on all printable characters

Posted on 2007-11-21
8
326 Views
Last Modified: 2010-04-21
Hi
I am trying to write a regular expression to match all printable character or more accuratly discard ASCII range 32 to 126.I thought it might be easier to match on any printable character.

However i can seem to get the RegExp to work in my java app.

I am trying

^[\w\d_~`!@#$%^&*()-+=<>?/\.,;:'"][}{\|]+$

but am not sure if its correct and not sure if i need to escape the \ character.

Help greatly appreciated.

My code is


public static void main(String[] args) {
          // Compile regular expression
            String patternStr =  "";
       
        //^[\w\d_~`!@#$%^&*()-+=<>?/\.,;:'"][}{\|]+$
       
//        String patternStr = "\\w";
        Pattern pattern = Pattern.compile(patternStr);
     
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        String inputString = null;
       
        try {
              inputString = br.readLine();
        } catch (IOException ioe) {
           System.out.println("Unknown Error");
           System.exit(1);
        }

        Matcher matcher = pattern.matcher(inputString);
        boolean matchFound = matcher.find();    // true
       
        System.out.println("Match Found " + matchFound);


      }

0
Comment
Question by:Molko
  • 5
  • 3
8 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 20326572
But is your intention to clean the string or just ignore it if it doesn't match?
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 20326608
In this case it would be more efficient and probably more convenient to do something like


boolean stillValid = true;
for (int i;i < s.length() && stillValid;i++) {
	char c = s.charAt(i)
	stillValid = (c >= ' ' && c <= '~');
}

Open in new window

0
 

Author Comment

by:Molko
ID: 20326680
Yes i intend to clean the string up
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 86

Expert Comment

by:CEHJ
ID: 20326698
Even more reason then to use the above (or a variant)
StringBuilder sb = new StringBuilder(line);
boolean stillValid = true;
for (int i = sb.length() - 1;i >= 0;i--) {
	char c = sb.charAt(i)
	if (c < ' ' || c > '~') {
		sb.deleteCharAt(i);
	}
}

Open in new window

0
 

Author Comment

by:Molko
ID: 20326730
Ok, thank you. I've been struggling with a regular expression for ages. Thanks

Oh, is there a reason you are reading throught the string in reverse order in the 2nd example ?

0
 
LVL 86

Accepted Solution

by:
CEHJ earned 500 total points
ID: 20326747
>>Oh, is there a reason you are reading throught the string in reverse order in the 2nd example ?

It makes altering the buffer in the loop less (un)problematic
0
 

Author Closing Comment

by:Molko
ID: 31410327
ok ...thanks for your help
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 20326776
:-)
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

I have been reconstructing a PHP-based application that has grown into a full blown interface system over the last ten years by a developer that has now gone into business for himself building websites. I am not incredibly fond of writing PHP code o…
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question