Enter your test strings:
        Testing '1c':
Capturing \d+ only:             1='1', 2='', 3=''
Capturing \d+ plus the letter:  1='1c', 2='', 3=''
        Testing '2w':
Capturing \d+ only:             1='', 2='2', 3=''
Capturing \d+ plus the letter:  1='', 2='2w', 3=''
        Testing '2c3w':
Capturing \d+ only:             1='3', 2='3', 3=''
Capturing \d+ plus the letter:  1='2c', 2='3w', 3=''
        Testing '1w1w':
Capturing \d+ only:             1='1', 2='1', 3=''
Capturing \d+ plus the letter:  1='', 2='1w', 3=''
        Testing '1w2r':
Capturing \d+ only:             1='2', 2='2', 3='2'
Capturing \d+ plus the letter:  1='', 2='1w', 3='2r'
        Testing '2r1c':
Capturing \d+ only:             1='1', 2='', 3='2'
Capturing \d+ plus the letter:  1='1c', 2='', 3='2r'