ex:tldr:b6790

This command is commonly used in various programming languages and text editors to perform global search and replace operation based on a regular expression within a text or file.

Let's break down the components of the command:

• %s/ is the starting part of the command indicating a search and replace operation.
• ${regular_expression} represents the regular expression pattern you want to search for within the text or file. A regular expression is a sequence of characters that defines a search pattern.
• ${replacement} represents the content that will replace the matched pattern(s) found by the regular expression.
• /g is an option at the end of the command, which stands for "global." It tells the command to replace all occurrences of the regular expression pattern found, rather than just the first one.

For example, if you have a text like "The quick brown fox jumps over the lazy dog" and you want to replace all occurrences of the word "brown" with "red", you would use the following command:

%s/brown/red/g

Executing this command will result in the updated text: "The quick red fox jumps over the lazy dog".