import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?:(?<=[^\\\\])|^)(\\\\(?:\\\\{2})*)(?=[^\\\\]|$)";
final String string = "\\startofline \\\\\n"
+ "\\ asf\n"
+ "sring\\e\n\n"
+ "yappadoo\\\\\\n\n"
+ "\\\\\\\\ fine\n"
+ "this is not\\\\\\\\\\ \n"
+ "\\\\\\\\\\\\\\\n\n"
+ "good\\\\nstring\\\\n and fine\\\\t\n"
+ "this is\\nbad\n"
+ "indent\\\\t\n"
+ " \\";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
while (matcher.find()) {
System.out.println("Full match: " + matcher.group(0));
for (int i = 1; i <= matcher.groupCount(); i++) {
System.out.println("Group " + i + ": " + matcher.group(i));
}
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html