Check for camel case in Python

python regex camelcasing
Dexter picture Dexter · Apr 17, 2012 · Viewed 10.4k times · Source

I would like to check if a string is a camel case or not (boolean). I am inclined to use a regex but any other elegant solution would work. I wrote a simple regex 

(?:[A-Z])(?:[a-z])+(?:[A-Z])(?:[a-z])+

Would this be correct? Or am I missing something?

Edit

I would like to capture names in a collection of text documents of the format 

McDowell
O'Connor
T.Kasting

Edit2

I have modified my regex based on the suggestion in the comments

(?:[A-Z])(?:\S?)+(?:[A-Z])(?:[a-z])+

Answer

William Bettridge-Radford picture William Bettridge-Radford · Apr 17, 2012

You could check if a string has both upper and lowercase.

def is_camel_case(s):
    return s != s.lower() and s != s.upper() and "_" not in s


tests = [
    "camel",
    "camelCase",
    "CamelCase",
    "CAMELCASE",
    "camelcase",
    "Camelcase",
    "Case",
    "camel_case",
]

for test in tests:
    print(test, is_camel_case(test))

Output:

camel False
camelCase True
CamelCase True
CAMELCASE False
camelcase False
Camelcase True
Case True
camel_case False

Related questions

How to do CamelCase split in python

What I was trying to achieve, was something like this: >>> camel_case_split("CamelCaseXYZ") ['Camel', 'Case', 'XYZ'] >>> camel_case_split("XYZCamelCase") ['XYZ', 'Camel', 'Case'] So I searched and found this perfect regular expression: (?<=[…

Read More
How to extract numbers from a string in Python?

I would extract all the numbers contained in a string. Which is the better suited for the purpose, regular expressions or the isdigit() method? Example: line = "hello 12 hi 89" Result: [12, 89]

Read More
Python string.replace regular expression

I have a parameter file of the form: parameter-name parameter-value Where the parameters may be in any order but there is only one parameter per line. I want to replace one parameter's parameter-value with a new value. I am using …

Read More