Expression | Meaning |
\s | Space Character |
\S | Except Space any character |
\d | Any Digit |
\D | Except Digit any character |
\w | Any word character [a-zA-Z0-9] |
\W | Special Chracter i.e Except word character |
. | Any character |
package demo.example3; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * @author Tyson * * Search for chracters which already have special meaning in Java Regex */ public class Demo3 { public static void main(String[] args) { // add \ before\s for escape because \ is a escape character printMatch("\\s", "a7b k@9", "Search for Space"); printMatch("\\S", "a7b k@9", "Search for anything Except Space"); printMatch("\\d", "a7b k@9", "Search for only digit"); printMatch("\\D", "a7b k@9", "Search for aything except digit"); printMatch("\\w", "a7b k@9", "Search for alphanumeric character"); printMatch("\\W", "a7b k@9", "Search for Special Character"); printMatch(".", "a7b k@9", "Search for Any Character"); } public static void printMatch(String regularExpression, String targetString, String comment) { Pattern p = Pattern.compile(regularExpression); Matcher m = p.matcher(targetString); System.out.println("===" + regularExpression + "===in===" + targetString + "=== " + comment); while (m.find()) { System.out.println(m.start() + "..." + m.group()); } System.out.println("\n"); } }
Output :
