Position of Apostrophe in Java Regex -


i'm trying see if log pattern layout has timestamp/date field , position in layout when splitted spaces. seems position of apostrophe in regular expression matters.

e.g. when have pattern .*%d[ate]*\\{([\\w\\.'-\\:]+)}.* matches layout of format %x{ip} %x{field1} %x{field2} [%date{yyyy-mm-dd't'hh:mm:ssz} guid=%{guid} userid=%{userid} %msg%n. however, when interchange - , ' in regular expression, runtime error below.

exception in thread "main" java.lang.exceptionininitializererror caused by: java.util.regex.patternsyntaxexception: illegal character range near index 19 .*%d[ate]*\{([\w\.-'\:]+)}.*                    ^     @ java.util.regex.pattern.error(pattern.java:1955)     @ java.util.regex.pattern.range(pattern.java:2655)     @ java.util.regex.pattern.clazz(pattern.java:2562)     @ java.util.regex.pattern.sequence(pattern.java:2063)     @ java.util.regex.pattern.expr(pattern.java:1996)     @ java.util.regex.pattern.group0(pattern.java:2905)     @ java.util.regex.pattern.sequence(pattern.java:2051)     @ java.util.regex.pattern.expr(pattern.java:1996)     @ java.util.regex.pattern.compile(pattern.java:1696)     @ java.util.regex.pattern.<init>(pattern.java:1351)     @ java.util.regex.pattern.compile(pattern.java:1028)

if explain significance of position of apostrophe, understand concept of regular expressions better.

you seems escape wrong characters inside character class. notice - special character used create range a-z .-' not correct range since index of . not before ' in unicode table.

to make - simple literal either escape "\\-" or place @ start/end of character class ([-...] [...-]) can no longer treated range operator.

also don't need escape . or : in character class.


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