Using re to find only uppercase letters

[nilamo]

Something still seems off, as that regex won't match the string.

>>> import re
>>> test = 'ChrX        74226540        T       t       50      .'
>>> test
'ChrX\t74226540\tT\tt\t50\t.'
>>> print(test)
ChrX    74226540        T       t       50      .
>>> raw_regex = r"^[Cc]hr(?:0?[1-9]|[1-9][0-9]|[MXY])\t0*[1-9][0-9]*\t[^\t]*\t[ATGC]{2}"
>>> regex = re.compile(raw_regex)
>>> regex.match(test)
>>> regex
re.compile('^[Cc]hr(?:0?[1-9]|[1-9][0-9]|[MXY])\\t0*[1-9][0-9]*\\t[^\\t]*\\t[ATGC]{2}')