How to enable named capture groups in java regex?

Question

I am new to regex in Java and I can't figure out how to include capturing group names in a group. I am writing ScrewTurn image converter for Confluence Universal Wiki Converter . This is what I have:

String image = "\\[image(?<align>auto)?\\|\\|{UP\\(((?<namespace>\\w+)\\.)?(?<pagename>[\\w-]+)\\)}(?<filename>[\\w- ]+\\.[\\w]+)\\]";

Pattern imagePattern = Pattern.compile(image, Pattern.CASE_INSENSITIVE);

He throws this exception in Pattern.comiple():

java.util.regex.PatternSyntaxException: Unknown look-behind group near index 19
\[image(?<align>auto)?\|\|{UP\(((?<namespace>\w+)\.)?(?<pagename>[\w-]+)\)}(?<filename>[\w- ]+\.[\w]+)\]
                   ^

I used the so-called capture groups, as before, in C # (?<namedgroup>asdf), but not in Java. What am I missing?

Answer 1

Java does not support named records.

Source: Are Java and C # Regular Expressions Supported?

Answer 2

, Java 7: Matcher (SE 6) vs Matcher (SE 7)

.: http://java.sun.com/javase/7/docs/api/java/util/regex/Pattern.html#groupname