Understanding regular expressions

Regular expressions give users grading certain question types the ability to evaluate responses against a set of acceptable values. A regular expression uses alpha-numeric and meta-characters to create a pattern that describes one or more strings that must be identically matched within a body of text.

You can use regular expressions in short answer, multi-short answer, arithmetic, significant figures, and fill in the blanks questions.

For example, the fill in the blank question "What word describes red, blue, green, yellow, pink, etc." can use regular expressions for the answer "colou?r*"