import re


def is_guid(techfin_tenant):
    """Validate guid arg

    Args:
        tenant (str): techfin tenant id

    Returns:
        bool: true if is valid guid value
    """
    c = re.compile('[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}', re.I)
    res = c.match(techfin_tenant)
    return res