Question

I need to verify a password using reqex. I have written one and tested it in this checker and it works:
http://www.nvcc.edu/home/drodgers/ceu/resources/test_regexp.asp

But when I add it to my Java application, it fails.

Regex in regex checker:(\D+)(\d+)(\D+)(.*)

Regex in java: (\\D+)(\\d+)(\\D+)(.*)

Test string: 1Hello2

This passes in the online checker but fails in Java.

Does anyone know why?

I want the regex to match any password that has a number in its middle (can have them at the start and end too).

I need 2 seperate regex: one that matches digits in the middle (pass1word or 1pass1word or 1pass1word) and also a regex that matches a digit at the start or end (1password or password1 NOT pass1word1 because that is in the string category).

Answer 1

Your regex requres:

1. not digit (1 or more times) \D+
2. 1 or more digits
3. One or more non-digits \D+
4. Any character(s) 0 or more times.

Your example contains

1. 1 Digit
2. 5 non-digits
3. 1 digit

I think it is obvious that it does not match the regex: the first element \D+ fails because digit appears in the beginning.