Admin: 1 версия

2010-06-01T06:01:07Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:43Z

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== Check if given string is a number (digits only) ==



<source lang="java">
public class Main {
public static boolean isNumber(String string) {
return string.matches("^\\d+$");
}
public static void main(String[] args) {
System.out.println(isNumber("123"));
}
}
</source>



== Check if given string is number with dot separator and two decimals ==



<source lang="java">

public class Main {
public static boolean isNumberWith2Decimals(String string) {
return string.matches("^\\d+\\.\\d{2}$");
}

public static void main(String[] args) {
sysout isNumberWith2Decimals("1234.123")

}
}
</source>



== Check if given string is numeric (-+0..9(.)0...9) ==



<source lang="java">

public class Main {
public static boolean isNumeric(String string) {
return string.matches("^[-+]?\\d+(\\.\\d+)?$");
}

public static void main(String[] args) {
sysout isNumeric("123.123")
}
}
</source>



== Match a single digit ==



<source lang="java">

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String args[]) {
// match a single digit
Pattern p = Pattern.rupile("\\d");
Matcher matcher = p.matcher("5");
boolean isOk = matcher.matches();
System.out.println("original pattern matches " + isOk);
// recycle the pattern
String tmp = p.pattern();
Pattern p2 = Pattern.rupile(tmp);
matcher = p.matcher("5");
isOk = matcher.matches();
System.out.println("second pattern matches " + isOk);
}
}
</source>



== Matcher Pattern number ==



<source lang="java">

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String args[]) {
Pattern p = Pattern.rupile("\\d");
Matcher m1 = p.matcher("55");
Matcher m2 = p.matcher("fdshfdgdfh");
System.out.println(m1.pattern() == m2.pattern());
// return true
}
}
</source>



== Match number ==



<source lang="java">

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] argv) throws Exception {
Pattern number = Pattern.rupile("\\G\\d+\\.?\\d*");
Matcher mat = number.matcher("this is a test 999");
System.out.println(mat.find());
}
}
//false
</source>

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Java/Regular Expressions/Digit Number - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010