import re


def isvowel(char):
    """Check whether char is tibetan vowel or not.

    Args:
        char (str): char to be checked

    Returns:
        boolean: true for vowel and false for otherwise
    """
    flag = False
    vowels = ["\u0F74", "\u0F72", "\u0F7A", "\u0F7C"]
    for pattern in vowels:
        if re.search(pattern, char):
            flag = True
    return flag