Using re to find only uppercase letters

[ranbarr]

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}')

I kinda figured it out.. for some reason when I use the {2} its case insensitive so I just seperated it to do it twice:

def isVCF(file):
    num_format = re.compile(r"^[Cc]hr(?:0?[1-9]|[1-9][0-9]|[MXY])\t0*[1-9][0-9]*\t[^\t]*\t[ATGC]\t[ATGC]")
    with open(file, "r+") as my_file:
        for line in my_file:
            if line.startswith("#"):
                continue
            if num_format.match(line):
                return True
            else:
                return False

I used the if line.startwith to skip the headline