Level 6Exercise #148

Build mini grep

Recursively search text files and return (path, line_number, line) for regex matches.

What you’ll practice

This Level 6 exercise focuses on pathlib + re in the Professional curriculum. Solve the challenge prompt above using clear, idiomatic Python and the relevant language or standard-library tools.

Relevant Python reference: re — Regular expression operations, pathlib — Object-oriented filesystem paths.

Sample Test Cases

Example #1

Input:mini_grep(root='logs', pattern='ERROR')

Output:matching file/line triples

Reference Solution

Reveal Reference Solution

def mini_grep(root: str, pattern: str):
    import re
    from pathlib import Path
    regex = re.compile(pattern)
    matches = []
    for path in Path(root).rglob('*.txt'):
        for number, line in enumerate(path.read_text().splitlines(), 1):
            if regex.search(line): matches.append((str(path), number, line))
    return matches

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Build mini grep

What you’ll practice

Sample Test Cases

Further Reading

Reference Solution