What is a question mark in regular expression?
1 Answer
Jun 8, 2016
A question mark represents any single letter (or symbol).
Explanation:
In regular expression a question mark stands for a single symbol. So for example:
-
To write an expression representing all 4 letter words starting with
#a# you have to use the expression#a???# . In this expression question marks represent second, third and fourth letter. -
To express all words with at least one letter you can use expression ?*. In this expression the question mark represents a letter which must be present, the asterisk represents a string which may also be empty.
