Geek Answers Handbook

Java regex String.matches work inconsistently

I have a regex that checks if a string is a number. The thousands separator format is a space; the decimal separator is a period. The after-decimal part is optional.

The problem is that at some point, the String.matches () function stops working as expected. What worked before doesn't work anymore.

For example, the JUnit code:

import junit.framework.Assert;
import org.junit.Test;

public class RegExTest {

    @Test
    public void testThousandSeperatorRegex()
    {
        String regEx = "([0-9]{1,3}( [0-9]{3})*(\\.[0-9]+)?|\\.[0-9]+)";
        Assert.assertEquals(true, "1".matches(regEx));
        Assert.assertEquals(true, "10".matches(regEx));
        Assert.assertEquals(true, "100".matches(regEx));
        Assert.assertEquals(true, "1 000".matches(regEx));
        Assert.assertEquals(true, "10 000".matches(regEx));
        Assert.assertEquals(true, "100 000".matches(regEx));
        Assert.assertEquals(true, "1 000 000".matches(regEx));
        Assert.assertEquals(true, "10 000 000".matches(regEx));
        Assert.assertEquals(false, "10000.56".matches(regEx));
        Assert.assertEquals(true, "8 734".matches(regEx));
    }
}

"8 734" . "1 000", . , 4- , ( !). , , , , . , . , - , , , , , . . String.matches() ?

- ? ^$, String.matches . java.util.regex jregex, .

JDK 6u31.

.

UPD: , Q . , , , . , , . , . , -, , , . , , . , , , :). , Qs.

+5
2

, .

, , , . - JVM .

.

+1

BTW: Pattern p = Pattern.compile(regEx) assertTrue(p.matcher("1 000 000").matches()). String matches ,

0

More articles:


All Articles