Region named capture (-1--1)

[davibaldin]

Hi,

Can you give me some feedback on this issue?

I'm trying to mach Named capture groups in a multiline byte[] content and getting a -1 -1 index range for group2 for pattern (A).

Pattern A is: (?[0-9.]{1,5}%)|(?dev = .*)

However, pattern (B) works fine for non multiline (\n) content.

Pattern B is: (?[0-9.]{1,5}%).*(?dev = .*)

Debug regex on: https://regex101.com/r/y2ER1a/1

Content (with multiline) is:
Content >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: icmp_seq=0 ttl=57 time=12.934 ms
64 bytes from 8.8.8.8: icmp_seq=1 ttl=57 time=13.145 ms

--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 12.934/13.040/13.145/0.106 ms
Content <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

My debug output is:

result = 226
D region Region:
0: (226-230) 1: (226-230) 2: (-1--1)
D nameEntry loss 1
loss -> 226, 230
0.0%
D nameEntry rtt 2
java.lang.StringIndexOutOfBoundsException: String index out of range: -1

My code is:

public class RegexOutputPluginHandler {

private byte[] patternBytes;
private Regex regex = null;


public RegexOutputPluginHandler() {
	String pattern = "(?<loss>[0-9\\.]{1,5}%)|(?<rtt>dev = .*)";
	
	if (pattern != null) {
		this.patternBytes = pattern.getBytes();
		this.regex = new Regex(this.patternBytes, 0, this.patternBytes.length, Option.MULTILINE, UTF8Encoding.INSTANCE);
	}
	
}


public Map<String, Object> extract(byte[] content) {
	
	System.err.println("D content " + content);

	if (content == null) {
		return null;
	}
	
	System.err.println("D content len " + content.length);

	Map<String, Object> fields = new HashMap<String, Object>();

	Matcher matcher = regex.matcher(content);
	int result = matcher.search(0, content.length, Option.MULTILINE);

	System.out.println("result = " + result);

if (result != -1) {
		Region region = matcher.getEagerRegion();
		
		System.out.println("D region " + region.toString());
		
		for (Iterator<NameEntry> entry = regex.namedBackrefIterator(); entry.hasNext();) {
			NameEntry e = entry.next();
			
			System.out.println("D nameEntry " + e.toString());
			
			int number = e.getBackRefs()[0]; // can have many refs per name
			int begin = region.beg[number];
			int end = region.end[number];

			String fieldName = new String(e.name, e.nameP, e.nameEnd - e.nameP);
			String fieldContent = new String(content, begin, end - begin);


			System.out.println(fieldName + " -> " + begin + ", " + end);
			System.out.println(fieldContent);

		}
	}else {
		System.err.println("D matcher none");
	}
	
	return fields;
}

}