VB.NET regex searching for AAA-9999 -

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i need finding first 3 capital letters a-z , space followed 4 numbers 0-9.

 dim individualclasses matchcollection = regex.matches(allexitclasses(a), "([a-z])([a-z])([a-z]) ([0-9])([0-9])([0-9])([0-9])")

an example input string aml 4309 or def 4298. above 7 characters want out of string.

edit: since preprocess input string, can use 

dim individualclasses matchcollection = regex.matches(allexitclasses(a).replace(" ", "-"), "[a-z]{3}[-][0-9]{4}")

regex explanation:

  • [a-z]{3} - 3 occurrences of english letters z
  • [-] - character class matching 1 hyphen
  • [0-9]{4} - 4 occurrences of digits 0 9.

note removed capturing groups since not seem using them @ all, , using limiting quantifiers, e.g. {4}.

note use input string , previous regex [a-z]{3}\p{zs}[0-9]{4}, need iterate through match collection , replace space in each match.value hyphen creating new array.

here ideone demo


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