字元類\s
匹配任何空格字元。
以下範例顯示了預定義字元類匹配的用法。
package com.yiibai;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PredefinedCharacterClassDemo {
private static final String REGEX = "\\s";
private static final String INPUT = "dbcabcab12\tc";
public static void main(String[] args) {
// create a pattern
Pattern pattern = Pattern.compile(REGEX);
// get a matcher object
Matcher matcher = pattern.matcher(INPUT);
while(matcher.find()) {
//Prints the start index of the match.
System.out.println("Match String start(): "+matcher.start());
}
}
}
執行上面範例程式碼,得到以下結果:
Match String start(): 10