
    Write a function to verify if a patient's identifier code follows the hospital's standardized format where the first and last characters must match for data integrity purposes. The function should return true if the identifier code is valid (starts and ends with the same character) and false otherwise.
    

    
import re
regex = '^[a-z]$|^([a-z]).*\\1$'

def check_char(string):
    """
    Write a function to verify if a patient's identifier code follows the hospital's standardized format where the first and last characters must match for data integrity purposes. The function should return true if the identifier code is valid (starts and ends with the same character) and false otherwise.
    

    """
import re
regex = '^[a-z]$|^([a-z]).*\\1$'

def check_char(string):
    """
    Write a function to verify if a patient's identifier code follows the hospital's standardized format where the first and last characters must match for data integrity purposes. The function should return true if the identifier code is valid (starts and ends with the same character) and false otherwise.
    

    """
    if re.search(regex, string):
        return 'Valid'
    else:
        return 'Invalid'