I have the following regex:
String regexContact = "^([0|\\+[0-9]{1,5})?([7-9][0-9]{9})$";
Android is pointing error at the end of the regex, saying:
Unclosed character class.
I have sifted through similar questions but could not find an answer for this particular error in my case. I am unable to find out if my regex itself is wrong somewhere. Any help would be appreciated.
^([0|\+[0-9]{1,5})?([7-9][0-9]{9})$
^↑ ^___^ ^ ^^___^^___^ ^
|_______________| |_____________|
This first [ is not closed, if you want to match it literally, you should escape it: \\[, otherwise you should close it with a corresponding ].
In Java regex flavor, the [ and ] symbols should be escaped inside a character class to denote literal symbols.
You have [0|\\+[0-9], where a [ is not escaped, and is considered a starting point for a character class, making the first [ unpaired, hence the error.
You need to remove the first [
String pat = "^(0|\\+[0-9]{1,5})?([7-9][0-9]{9})$";
^^
so as to match:
^ - start of string(0|\\+[0-9]{1,5})? - an optional group matching 1 or 0 occurrences of
0 - a zero| - or\+[0-9]{1,5} - a plus symbol and any 1 to 5 digits([7-9][0-9]{9}) - Group 2 matching a 7, 8 or 9 and then any nine digits (these parentheses here can be removed)$ - up to the end of string.See the regex demo
[as it is just erroneous as it starts a character class.