Java Regex Having Invalid escape sequence

I am new to Regex.

I have data(String[] array) in address formart

example

105 MyOwn St, City, ON A1B 2C3, Canada

Sometimes i got it as

 -  MyOwn st, City, A1B 2C3, Canada
 - City, A1B 2C3
 - 105 MyOwn St, City, ON A1B 2C3
 - City, ON A1B 2C3, Canada

I want the following result

Street: 105 MyOwn St or MyOwn st
City: City
Postal Code : A1B 2C3
Country : Canada

^ I have used if else to check if the string size. and used some methods to get my desired result.

I want to improve my functionality.

So, what i am going to do now is, create some regex patterns and use a switch statement.

so as, i am new to regex, i tried this pattern on my complete string it does match and give me a result in 4 groups, i tried it here (http://regexr.com/)

Pattern datePatt = Pattern.compile("^(\d+\s+[a-zA-z]+\s+\w+)[,](\s*[a-zA-Z]+)[,](\s+[a-z|A-Z]{2}\s+[a-zA-Z][0-9][a-zA-Z]\s*[0-9][a-zA-Z][0-9])[,](\s+[a-zA-Z]{6})$");

this pattern matches my string

But when i tried it in eclipse it gives me error

Invalid escape sequence (valid ones are  \b  \t  \n  \f  \r  \"  \'  \\ )

I am looking for help in my pattern , why i am getting this error?