<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def split_log(logf):
 """split concat log into individual samples"""

        flashpatt = re.compile(
            r'\[FLASH\] Fast Length Adjustment of SHort reads\n(.+?)\[FLASH\] FLASH', flags=re.DOTALL)
        return flashpatt.findall(logf)