grep and egrep are the types of regular expression.
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Actually, `grep` and `egrep` are not types of regular expressions but rather commands or programs that utilize regular expressions for pattern matching.
1. `grep`: `grep` stands for “Global Regular Expression Print.” It is a command-line utility in Unix-like operating systems used for searching files or streams for lines that match a specified pattern. The patterns used by `grep` are regular expressions. `grep` uses Basic Regular Expressions (BRE) by default, which supports basic pattern matching features.
2. `egrep`: `egrep` (Extended grep) is also a command-line utility in Unix-like operating systems. It is an extended version of `grep` that supports more advanced regular expressions. `egrep` uses Extended Regular Expressions (ERE) by default, which provides additional pattern matching capabilities compared to Basic Regular Expressions.
Regular expressions are powerful tools for pattern matching and can be used with various programming languages and command-line utilities, including `grep` and `egrep`. They allow you to define complex search patterns using special characters, quantifiers, character classes, and more.
In summary, `grep` and `egrep` are not types of regular expressions but rather tools that use regular expressions for pattern matching, with `egrep` supporting more advanced regular expression features compared to `grep`.