def METHOD_NAME(line):
    """Extract file name and line number from line of text.
    Check if line of text contains one of the file/line patterns.
    If it does and if the file and line are valid, return
    a tuple of the file name and line number.  If it doesn't match
    or if the file or line is invalid, return None.
    """
    if not file_line_progs:
        compile_progs()
    for prog in file_line_progs:
        match = prog.search(line)
        if match:
            filename, lineno = match.group(1, 2)
            try:
                f = open(filename, "r")
                f.close()
                break
            except OSError:
                continue
    else:
        return None
    try:
        return filename, int(lineno)
    except TypeError:
        return None