Answer Posted / Devendra Dangwal
Regular expressions (regex) are sequences of characters that form a search pattern. They are used to match, search, and manipulate text in Perl. Some common regex elements include:
* ^ - matches the start of a line
* $ - matches the end of a line
* . - matches any single character except a newline
* [] - matches any character inside the brackets
* () - groups characters for reuse or priority
* | - matches either of the patterns on its left or right
* ?, +, * - quantifiers that specify how many times a pattern should match
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