# 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 {{1}} -m {{string_to_match}} {{data.csv}}` - Find rows in which columns 3 or 4 match a certain regular expression: `csvgrep -c {{3,4}} -r {{regular_expression}} {{data.csv}}` - Find rows in which the "name" column does NOT include the string "John Doe": `csvgrep -i -c {{name}} -m "{{John Doe}}" {{data.csv}}`