# csvgrep > Filter CSV rows with string and pattern matching. > Included in csvkit. > More information: . - Find rows that have a certain string in column 1: `csvgrep {{[-c|--columns]}} {{1}} {{[-m|--match]}} {{string_to_match}} {{data.csv}}` - Find rows in which columns 3 or 4 match a certain regular expression: `csvgrep {{[-c|--columns]}} {{3,4}} {{[-r|--regex]}} {{regular_expression}} {{data.csv}}` - Find rows in which the "name" column does NOT include the string "John Doe": `csvgrep {{[-i|--invert-match]}} {{[-c|--columns]}} {{name}} {{[-m|--match]}} "{{John Doe}}" {{data.csv}}`