Regular Expression To Match 3 Capital Letters Followed By A Small Letter Followed By 3 Capital Letters?

I need a regular expression in python which matches exactly 3 capital letters followed by a small letter followed by exactly 3 capital letters. For example, it should match ASDfGHJ

Solution 1:

r'\b[A-Z]{3}[a-z][A-Z]{3}\b'

This will match what you posted if it is a complete word.

r'(?<![^A-Z])[A-Z]{3}[a-z][A-Z]{3}(?![A-Z])'

This will match what you posted so long as it's not preceded or followed by another capital letter.

Solution 2:

here it is:

'[A-Z]{3}[a-z]{1}[A-Z]{3}'

Edited you need to use word boundary also:

r'\b[A-Z]{3}[a-z]{1}[A-Z]{3}\b'

Solution 3:

re.findall(r'[a-z][A-Z]{3}([a-z])[A-Z]{3}[a-z]', data)

Solution 4:

This is will check that one small character is exactly present between 3 capital characters on both sides.

I have used lookahead and lookbehind to ensure that exactly three capital characters are on both sides.

r'(?<![A-Z])[A-Z]{3}[a-z][A-Z]{3}(?![A-Z])'.

Solution 5:

>>>import re>>>pattern = r'^[A-Z]{3}[a-z]{1}[A-z]'>>>re.match(pattern , "ABCaABC").start()
    0
>>>print re.match(pattern , "ABCABC")
    None
>>>print re.match(pattern , "ABCAABC")
    None
>>>print re.match(pattern , "ABCAaABC")
    None
>>>print re.match(pattern , "ASDFgHJK")
    None
>>>print re.match(pattern , "ABCaABC")
    <_sre.SRE_Match object at 0x011ECF70>

r'^[A-Z]{3}[a-z]{1}[A-z]' ^ ->Start with capital, so First three letters must be capital.