Android: PatternSyntaxException: Syntax error U_ILLEGAL_ARGUMENT_ERROR

Question

I\'m using json-io for converting some JSON data to Java objects:

DataTransferContainer dataTransferContainer = (DataTransferContainer)JsonReader.jsonToJava(         


        

Answer 1

In ICU regex patterns, bracket expression pattern cannot start with :.

You need to change the pattern to

Pattern.compile("(\\d{2})[.:](\\d{2})[.:](\\d{2})[.](\\d{1,10})([+-]\\d{2}:?\\d{2}|Z)?")

Note the changes:

• [:] is changed to :
• [:.] is changed to [.:]

The regex library used in Android is ICU, and one of its peculiarities is that it supports POSIX character classes outside bracket expressions. That means you may write [[:digit:]] to match a digit, or [:digit:] (which is invalid in most other regex flavors including POSIX). The ICU regex parser seems to have problems parsing bracket expressions starting with : and surely it is a bug.