Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Chapter 10

1. What is a search pattern? A regular expression syntax which allows us to find pieces of text with specified characteristics, such as length, content and location on a line.
2. Why are regular expressions considered greedy? Most regular expression try to find as much data as they can that match the search pattern. This includes whitespace and other punctuation, which is a logical separation for humans but not necessarily for a machine.
3. Which character in search patterns is considered a wildcard for any one character, except newlines? The dot (.).
4. How is the asterisk used in Linux regular expression search patterns? The * is used in combination with another character to allow it to form a repeating character. Example search pattern: ...