Python 3.4.4 (v3.4.4:737efcadf5a6, Dec 20 2015, 20:20:57) [MSC v.1600 64 bit (AMD64)] on win32
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>>> import re
>>> msg = "Express PerCI"
>>> print(re.match(r"PerCI", msg))
None
>>> pattern = r"perci|full\s*perci|express\s*perci"
>>> print(re.match(pattern, msg, re.IGNORECASE))
<_sre.SRE_Match object; span=(0, 13), match='Express PerCI'>
>>> print(re.match(pattern, "Express PerCI", re.IGNORECASE))
<_sre.SRE_Match object; span=(0, 13), match='Express PerCI'>
>>> print(re.match(pattern, "Full PerCI", re.IGNORECASE))
<_sre.SRE_Match object; span=(0, 10), match='Full PerCI'>
>>> print(re.match(pattern, "Something else PerCI", re.IGNORECASE))
None
>>>