Repetitions

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Matching {x} Repititions

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

• S must be of length equal to 45.

• The first 40 characters should consist of letters(both lowercase and uppercase), or of even digits.

• The last 5 characters should consist of odd digits or whitespace characters.

^[a-zA-z02468]{40}[13579\s]{5}$

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Matching {x, y} Repititions

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

• S should begin with 1 or 2 digits.

• After that, S should have 3 or more letters (both lowercase and uppercase).

• Then S should end with up to 3. symbol(s). You can end with 0 to 3. symbol(s), inclusively.

^\d{1,2}[a-zA-Z]{3,}\.{,3}$

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Matching Zero Or More Repititions

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

• S should begin with 2 or more digits.

• After that, S should have 0 or more lowercase letters.

• S should end with 0 or more uppercase letters

^\d{2,}[a-z][A-Z]$

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Matching One Or More Repititions

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

• S should begin with 1 or more digits.

• After that, S should have 1 or more uppercase letters.

• S should end with 1 or more lowercase letters.

^\d+[A-Z]+[a-z]+$

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Matching Ending Items

Write a RegEx to match a test string, S, under the following conditions:

• S should consist of only lowercase and uppercase letters (no numbers or symbols).

• S should end in s.

^[a-zA-Z]*s$