Character Class

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Matching Specific Characters

You have a test string S. Your task is to write a regex that will match S with following conditions:

• S must be of length: 6

• First character: 1, 2 or 3

• Second character: 1, 2 or 0

• Third character: x, s or 0

• Fourth character: 3, 0 , A or a

• Fifth character: x, s or u

• Sixth character: . or ,

^[1-3][120][xs0][30Aa][xsu][\.,]$

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Excluding Specific Characters

You have a test string S. Your task is to write a regex that will match S with the following conditions:

• S must be of length 6.

• First character should not be a digit (1, 2, 3, 4, 5, 6, 7, 8, 9 or 0).

• Second character should not be a lowercase vowel (a, e, i, o or u).

• Third character should not be b, c, D or F.

• Fourth character should not be a whitespace character ( \r, \n, \t, \f or <space> ).

• Fifth character should not be a uppercase vowel (A, E, I, O or U).

• Sixth character should not be a . or , symbol.

^[^\d][^aeiou][^bcDF][^\s][^AEIOU][^\.,]$

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Matching Character Ranges

Write a RegEx that will match a string satisfying the following conditions:

• The string’s length is >= 5.

• The first character must be a lowercase English alphabetic character.

• The second character must be a positive digit. Note that we consider zero to be neither positive nor negative.

• The third character must not be a lowercase English alphabetic character.

• The fourth character must not be an uppercase English alphabetic character.

• The fifth character must be an uppercase English alphabetic character.

^[a-z][1-9][^a-z][^A-Z][A-Z]