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启用多行模式。
通常,^和$元字符将给定输入的开头和结尾与指定字符匹配,而不管其行数如何。
import java.util.regex.Matcher; import java.util.regex.Pattern; public class MULTILINE_Example { public static void main( String args[] ) { //String regex = "(^This)";//.*t$)"; String input = "2234 "This is a sample text\n" + "1424 This second 2335 line\n" + "This id third 455 line\n" + "Welcome to w3codebox\n"; Pattern pattern = Pattern.compile("^([0-9]+).*");//, Pattern.MULTILINE); Matcher matcher = pattern.matcher(input); System.out.println(matcher.group(1)); } } }
输出结果
2234
当将此值用作compile()
方法的标志值时,整个输入序列将被视为单行,并且元字符^和$匹配给定输入序列的开头和结尾。
import java.util.regex.Matcher; import java.util.regex.Pattern; public class MULTILINE_Example { public static void main( String args[] ) { //String regex = "(^This)";//.*t$)"; String input = "2234 "This is a sample text\n" + "1424 This second 2335 line\n" + "This id third 455 line\n" + "Welcome to w3codebox\n"; Pattern pattern = Pattern.compile("^([0-9]+).*", Pattern.MULTILINE); Matcher matcher = pattern.matcher(input); System.out.println(matcher.group(1)); } } }
输出结果
2234 1424