How to get the regex code for words spilted by underscore?

i have a problem in my project.
WHAT I WANT TO DO ?
i need to get all word split by underscore in python code:

text = "i.am - M_o_h_a_m_m_e_d - and - _1_5y_o - name - moh_mmed - 2_8_j - i___a_m"
re.findall(r'?????' , text)

i need to get :

['M_o_h_a_m_m_e_d','_1_5y_o','i___a_m']

NOTE : if the word starts by a number like (15yo) will be a underscore before the starting number

WRONG : M_o_h_a_m_m_e_d , M_o_h_a_m_m_e_d

WRONG : 1_5_y_o

>Solution :

Here’s a non-regex approach:

text = "i.am - M_o_h_a_m_m_e_d - and - _1_5y_o - name - moh_mmed - 2_8_j - i___a_m"
result = []

for word in text.split(' - '):
    if word[0].isdigit() or word[0] == '_' and not word[1].isdigit():
        continue
    for char in word.split('_'):
        if len(char) > 1 and not (char[0].isdigit() ^ char[1].isdigit()):
            break
    else:
        result.append(word)

print(result)

Output:

['M_o_h_a_m_m_e_d', '_1_5y_o', 'i___a_m']

Assuming the rules are:

1. Words are split with underscores, except:
2. If two subsequent characters are a number and a letter, and
3. Numbers in the first position are prepended by an underscore.