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Regular expression

Chris Bro

Joined: Aug 26, 2004
Posts: 2
Hi all,

I am not verry good in regular expressions and try to remove the character which looks like a square or a rectangle form a String. But I really do not know how to do that. I know that since JDK 1.4 regular expressions are in the package but how do I express this character? It is a non ASCII character and I am not able to paste it here.
I have to send this String using SOAP and during the data encryption the server crashes.
Is there a way to remove all non ASCII characters from a String or has someone
an other adivce?

Thanks in advance

Tong Chen
Ranch Hand

Joined: Apr 26, 2002
Posts: 1011
try this:

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

This makes sure string only contains characters that appear on keyboard. Extended characters (such as those with ascii values above 127), will not pass the test.

Chris Bro

Joined: Aug 26, 2004
Posts: 2
Hi Tong,

first thank you for your fast reply. Could you please give me a little example how to embed this in Java? As I mentioned I never done this in Java before and unfortunately it is very urgent.


somkiat puisungnoen
Ranch Hand

Joined: Jul 04, 2003
Posts: 1312
What are regular expressions?

A regular expression, also known as a regex or regexp, is a string whose pattern (template) describes a set of strings. The pattern determines what strings belong to the set, and consists of literal characters and metacharacters, characters that have special meaning instead of a literal meaning. The process of searching text to identify matches�strings that match a regex's pattern�is pattern matching.

Java's java.util.regex package supports pattern matching via its Pattern, Matcher, and PatternSyntaxException classes:

Pattern objects, also known as patterns, are compiled regexes

Matcher objects, or matchers, are engines that interpret patterns to locate matches in character sequences, objects whose classes implement the java.lang.CharSequence interface and serve as text sources

PatternSyntaxException objects describe illegal regex patterns

Code example

java RegexDemo apple applet

Regex = apple
Text = applet

Found apple
starting at index 0 and ending at index 5

Java Developer, Thailand
I agree. Here's the link:
subject: Regular expression
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