Remember to use 2 lookaheads
to check the patterns in the string. The first lookahead
is very similar to that given in the example - '(?=\w{3,6})
- only the lower-number
3 is too low for our test cases, and an upper-number
is completely unnecessary. This first lookahead
is only used to find a string consisting of a certain amount of characters. A second lookahead
must be used to check for consecutive numerical values at the end of the string.
The second lookahead
is also similar to that given in the example - (?=\D*\d)
- however, this expression too must be modified to pass all test cases. Remember to specify the exact amount of numbers you want to appear at the end of the string.