Less fails with PatternSyntaxException

[snuyanzin]

java.util.regex.PatternSyntaxException: Unclosed character class near index 77
'([^'\]|(\\["'abfnrtv\\]))'" "'\\(([0-3]?[0-7]{1,2}))'" "'\\x[0-9A-Fa-f]{1,2}'
                                                                             ^
	at java.util.regex.Pattern.error(Pattern.java:1969)
	at java.util.regex.Pattern.clazz(Pattern.java:2562)
	at java.util.regex.Pattern.sequence(Pattern.java:2077)
	at java.util.regex.Pattern.expr(Pattern.java:2010)
	at java.util.regex.Pattern.group0(Pattern.java:2919)
	at java.util.regex.Pattern.sequence(Pattern.java:2065)
	at java.util.regex.Pattern.expr(Pattern.java:2010)
	at java.util.regex.Pattern.compile(Pattern.java:1702)
	at java.util.regex.Pattern.<init>(Pattern.java:1352)
	at java.util.regex.Pattern.compile(Pattern.java:1028)
	at org.jline.builtins.Nano$NanorcParser.doPattern(Nano.java:1797)
	at org.jline.builtins.Nano$NanorcParser.addHighlightRule(Nano.java:1784)
	at org.jline.builtins.Nano$NanorcParser.parse(Nano.java:1697)
	at org.jline.builtins.Nano$SyntaxHighlighter.build(Nano.java:1435)
	at org.jline.builtins.Less.openSource(Less.java:1023)
	at org.jline.builtins.Less.run(Less.java:324)
	at org.jline.builtins.Commands.less(Commands.java:150)
	at org.jline.builtins.Commands.less(Commands.java:122)

As WA with disabled highlighting it works ok

[mattirn]

Fixed nanorc file parsing. Now highlighting rule is parsed correctly but one regex is not valid for Java:

PatternSyntaxException: Unclosed character class near index 26
'([^'\]|(\\["'abfnrtv\\]))'
                          ^

I would write this regex as '([^'\\]|(\\["'abfnrtv\\]))'. I think the only reasonable solution is to edit the nanorc file.