lookarounds

When working with text processing in a Linux environment, grep is an indispensable tool. It allows you to search through text using powerful regular expressions. In this article, we'll explore how to use grep with lookahead and lookbehind assertions for matching overlapping patterns, which is particularly handy for complex text patterns. A1: The -o option in grep tells it to only output the parts of a line that directly match the pattern. Without this option, grep would return the entire line in which the pattern occurs. This is particularly useful when you want to isolate all instances of a matching pattern.