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How to search for a pattern in a Java string?
Java provides the java.util.regex package for pattern matching with regular expressions. You can then search for a pattern in a Java string using classes and methods of this packages.
Example
import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexMatches { public static void main( String args[] ) { String line = "This order was placed for QT3000! OK?"; String pattern = "(.*)(\d+)(.*)"; Pattern r = Pattern.compile(pattern); Matcher m = r.matcher(line); if (m.find( )) { System.out.println("Found value: " + m.group(0)); System.out.println("Found value: " + m.group(1)); System.out.println("Found value: " + m.group(2)); }else{ System.out.println("NO MATCH"); } } }
Output
Found value: This order was placed for QT3000! OK? Found value: This order was placed for QT300 Found value: 0
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