import re
line = 'Drosophila_melanogaster_12215:0.0000010229,'
search = 'Drosophila_melanogaster_12215'
my_regex = re.compile(re.escape(search) + r':0\.\d{10}')
print(my_regex.findall(line))
aW1wb3J0IHJlCgpsaW5lID0gJ0Ryb3NvcGhpbGFfbWVsYW5vZ2FzdGVyXzEyMjE1OjAuMDAwMDAxMDIyOSwnCnNlYXJjaCA9ICdEcm9zb3BoaWxhX21lbGFub2dhc3Rlcl8xMjIxNScKCm15X3JlZ2V4ID0gcmUuY29tcGlsZShyZS5lc2NhcGUoc2VhcmNoKSArIHInOjBcLlxkezEwfScpCnByaW50KG15X3JlZ2V4LmZpbmRhbGwobGluZSkp