Basic examples

Question 1

Line starts with a vowel or uppercase character

Answer 1

ˆ[aeiou[:upper:]]

Question 2

Check for upper case characters

Answer 2

[A-Z]

Question 3

Check for numbers between 0-9

Answer 3

[0-9]

Question 4

Check for alphabet charcter or digit

Answer 4

[[:alnum:]]