Name validation using IGNORECASE in Python Regex

In this article, we will learn about how to use Python Regex to validate name using IGNORECASE.

re.IGNORECASE : This flag allows for case-insensitive matching of the Regular Expression with the given string i.e. expressions like [A-Z] will match lowercase letters, too. Generally, It’s passed as an optional argument to re.compile().

Let’s consider an example of a form where the user is asked to enter their name and we have to validate it using RegEx. The format for entering name is as follow:

Mr. or Mrs. or Ms. (Either one) followed by a single space
First Name, followed by a single space
Middle Name(optional), followed by a single space
Last Name(optional)

Examples:

Input : Mr. Albus Severus Potter 
Output : Valid

Input : Lily and Mr. Harry Potter
Output : Invalid

Note : Since, we are using IGNORECASE flag, the first character of First, Second, and Last name may or may not be capital.

Below is the Python code –

# Python program to validate name using IGNORECASE in RegEx 
  
# Importing re package 
import re 
  
def validating_name(name): 
  
    # RegexObject = re.compile( Regular expression, flag ) 
    # Compiles a regular expression pattern into a regular expression object 
    regex_name = re.compile(r'^(Mr\.|Mrs\.|Ms\.) ([a-z]+)( [a-z]+)*( [a-z]+)*$',  
              re.IGNORECASE) 
  
    # RegexObject is matched with the desired  
    # string using search function 
    # In case a match is found, search() returns 
    # MatchObject Instance 
    # If match is not found, it return None 
    res = regex_name.search(name) 
  
    # If match is found, the string is valid 
    if res: print("Valid") 
          
    # If match is not found, string is invalid 
    else: print("Invalid") 
  
# Driver Code 
validating_name('Mr. Albus Severus Potter') 
validating_name('Lily and Mr. Harry Potter') 
validating_name('Mr. Cedric') 
validating_name('Mr. sirius black') 

Output:

Valid
Invalid
Valid
valid

My Personal Notes

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