In extended regex, what is the optionality character?Note: Be precise in your answer. The character must be expressed exactly as it would be in a bash regex
Question
In extended regex, what is the optionality character?
Note: Be precise in your answer. The character must be expressed exactly as it would be in a bash regex.
Solution
In extended regular expressions, the optionality character is represented by the question mark ?. This character indicates that the preceding element is optional, meaning it can occur either zero or one time in the input string.
For example, in a regex like colou?r, the u? part of the expression denotes that the letter 'u' may or may not appear in the string being matched. Thus, this regex would successfully match both "color" and "colour". By using the question mark, you can create flexible patterns that can accommodate variations in the text, making regex a powerful tool for string manipulation and search operations in programming and data processing contexts.
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