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5) Write a regular expression would zip code + 4 fields of the forms: xxxxx-xxxx where x is any number but the last 4 digits could be missing. The dash at the end of the first 5 numbers will ALWAYS be present AND the field is delineated with spaces or tabs.

Respuesta :

CPED

Answer:

Following is the expression written in "Bash script" (mixture of commands):

^\d{5}(?:[-\s]\d{4})?$

Explanation:

  • ^ = For staring string (denotation).
  • \d{5} = Matching 5 digits (first five unknown x's)
  • (?:…) = Making Group (making group of former 5 digits)
  • [-\s] = Match a hyphen  or a space

                 (checking if a hyphen is present?)

  • \d{4} = Matching 4 digits (next four unknown x's)
  • …? = Pattern before it is optional
  • $ = Ending of the string.(denotation)

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