Find and replace is widely used for: batch document editing, code refactoring (renaming variables), data cleaning (removing/reformatting specific data), text normalization, and template content filling.
Regex enables pattern-based replacements. Common patterns: \\d+ (digits), \\w+ (words), ^ (line start), $ (line end). Use $1-$9 for captured groups. E.g., "(\\w+)@(\\w+)" extracts username and domain from email addresses.
Tips: 1) Test regex on small samples first; 2) Use "Count Matches" to check scope; 3) Backup original text before replacing; 4) Use backreferences ($1) to preserve parts of the original content.