12.11. Practice Problems - Regular Expressions

Construct a regex that matches both cat and cats.

--blocks-- cat s ? *

Construct a regex that matches abc followed by zero to many digits (0-9).

--blocks-- abc \d * /d +

Construct a regex that matches both gray and grey.

--blocks-- gr [ae] y {ae}

Construct a regex that matches br followed by any single character except for a new line and then a 3.

--blocks-- br . 3 * \3

Construct a regex that matches t.forward.

--blocks-- t \. forward .

Construct a regex that matches a word that starts with an uppercase letter followed by at least one lowercase letter, like “Apple”, “Banana”, or “Carrot”.

--blocks-- [A-Z] [a-z] + \w *

Construct a regex that matches eight word characters (letter, digit, or underscore).

--blocks-- \w {8} (8) \W

Construct a regex that matches one or more lowercase letters (a-z) followed by a space character and then two to four digits.

--blocks-- [a-z] + \s \d {2,4} * \D {2:4}

Construct a regex to capture numbers with 5-7 digits. For example: 48105, 103028, 1234567.

--blocks-- \d {5,7} /d {5:7}

Construct a regex that captures strings that have two digits followed by a period and then four letters from a to z.

--blocks-- \d {2} \. [a-z] {4} . [2] \w [4]

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