how to check if a string contains only lower case letters and numbers?

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How can I check if a string contains only numbers and lower case letters?

I only managed to check if it contains numbers and lower case letters and doesn't contain upper case letters but I don't know how to check that it doesn't contain any symbols as ^&*(% etc..

if(any(i.islower() for i in password) and any(i.isdigit() for i in password) and not any(i.isupper() for i in password)):

EDIT: so apparently I need to do this without using any loops and mainly using functions like .islower() , .isdigit() , isalnum() etc.. and I have no idea how I can check if a string contains lower case letters and numbers only , without using loops or something that will check every single char in the string . we only started to learn the basics in python so they told us we can't use "for" and all that even if I know what it does.. now I can check if an entire string is only digits or lower/upper case letters but I don't know how to check the two conditions mentioned above in the simplest way possible

What about:

if all(c.isdigit() or c.islower() for c in password):

after all, you want to check that all characters are either a digit or lowercase letters. So for all characters c, that character is c.isdigit() or c.islower(). Now an all(..) takes as input an iterable of values and checks if the truthiness of all these values is True. So from the moment there is one digit that does not satisfies our condition, the all(..) will return False.

Mind however that all(..) is True if there are no elements. Indeed if the password is the empty string, all the characters satisfy this condition, since there are no characters.

EDIT:

In case you want to check that the password contains both digits and lowercase characters, you can alter the condition to:

if all(c.isdigit() or c.islower() for c in password) and \
       any(c.isdigit() for c in password) and \
       any(c.islower() for c in password):

Now the check will only succeed if there are at least two characters in password: a lower and a digit.

How to check if a string contains only lower case letters in Python?, We can check if a string contains only lower case letters using 2 methods. First is using method islower().For example:print('Hello  You can use isdigit() or islower() method to check string contains only numbers and lower case letters. import string input_str=raw_input() for ch in input_str: if ch.isdigit() or ch.islower(): output_str=True else: output_str=False break print output_str

How about use regex:

>>> def is_digit_and_lowercase_only(s):
        return re.match("^[\da-z]+$", s)
>>> print is_digit_and_lowercase_only("dA")
None
>>> print is_digit_and_lowercase_only("adc87d6f543sc")
<_sre.SRE_Match object at 0x107c46988>

It'll return None if match failed, so you can use it with if.

A method to detect if string contains only uppercase letter in Java, Character#isUpperCase() and #isLetter() instead of the magic numbers. Anthony Kaser. Your example will return false if the String contains any lower case  We can check if a string contains only lower case letters using 2 methods. First is using method islower (). You can also use regexes for the same result. For matching only lowercase, we can call the re.match (regex, string) using the regex: "^ [a-z]+$".

Another solution is to count the letters of each type and make sure they're not zero (in this context True equates to 1 and False to 0):

def validate_password(password):
    """
    Return True if password contains digits and lowercase letters
    but nothing else and is at least 8 characters long; otherwise
    return False.

    """

    ndigits = sum(c.isdigit() for c in password)
    nlower = sum(c.islower() for c in password)
    password_length = len(password)
    return (password_length > 7 and ndigits and nlower and
            (ndigits+nlower)==password_length)

Python Exercises: Match a string that contains only upper and , Python Exercises, Practice and Solution: Write a Python program to match a string that contains only upper and lowercase letters, numbers, and  In this quick tutorial, we'll illustrate how we can check if a String is containing at least one of each of the following: uppercase letter, lowercase letter, digit or special character in Java. 2. Using Regular Expressions. One of the ways to perform our check is by using regular expressions.

Define a function that applies your rules using sets for membership testing .

import string
lower = set(string.ascii_lowercase)
digits = set(string.digits)
def valid(s):
    '''Test string for valid characters, and composition'''

    s = set(s)
    invalid = s.difference(lower, digits)
    both = s.intersection(lower) and s.intersection(digits)
    return bool(both and not invalid)

Usage:

>>> valid('12234')
False
>>> valid('abcde')
False
>>> valid('A123')
False
>>> valid('a$1')
False
>>> valid('1a')
True
>>>

How to check if a string is all upper case (lower case) characters?, There is function is_upper in Perl, so how can we check if a string contains only upper Of course it is rare that a string would only consist of upper case letters. Check if String contains only Alphabets (Letters) and Numbers (Digits) using Regular Expression in JavaScript When the Button is clicked, the Validate JavaScript function is called. Inside the Validate JavaScript function, the value of the TextBox is tested against the Regular Expression Alphabets (Letters) and Numbers (Digits) i.e. AlphaNumeric.

You can use isdigit() or islower() method to check string contains only numbers and lower case letters

import string
input_str=raw_input()


for ch in input_str:

    if  ch.isdigit() or  ch.islower():
        output_str=True

    else:
        output_str=False
        break   

print output_str

Regex to check if a string contains only letters(lower/caps), numbers , For the first case this should work: if [[ $A = \w+ ]]. \w mathches a "word" character, which includes the underscore. It may recognize some  You can loop on the chars of string and check using the Char Method IsLetter but you can also do a trick using String method IndexOfAny to search other charaters that are not suppose to be in the string.

Check if a string contains only alphabets in Java using Regex , Printing initial string. print ( "Initial String" , ini_str). # Code to check whther string contains only number. if ini_str.isalpha():. print ( "String contains only letters" ). Instead of checking that the string doesn't contain alphabetic characters, check to be sure it contains only numerics. If you actually want to use the numeric value, use Integer.parseInt() or Double.parseDouble() as others have explained below.

Python, Learn how we to check if a String contains at least one uppercase letter, lowercase letter, digit or special character in Java. I just announced the new Learn Spring course, focused on the fundamentals of Spring 5 and Spring  To compare strings and check if string contains special characters there are two methods. Either we match the pattern with all the available special characters or we do the opposite. We have a logic to check if a string contains only alphabets and numbers, we use that pattern and reverse it to get to know & check if string contains special

Java Check a String for Lowercase/Uppercase Letter, Special , Javascript check if string contains only letters and spaces. Or even a string that only consists of numbers, upper-case and lower-case letters, and has to have  Do you want it to match for only numbers, upper-case and lower-case letters, or make sure the string contains at least one of each? Or even a string that only consists of numbers, upper-case and lower-case letters, and has to have one of each?

Comments
  • You are looking for the re module. It allows regex checking. docs.python.org/3/library/re.html
  • but I need to make sure the string contains both numbers and lower case letters . and if i'll use this condition - it will return true if the string contains lower case letters only or if the string contains numbers only.. and I need it to return true when the string contains lower case letters and numbers only
  • If part of your answer is incorrect, don't just add a correct version below an "EDIT". Remove the incorrect part, it's useless.
  • @BryanOakley: well the all(..) part is the answer to how enforce that the password only contains lowers and digits :). Which is the added value. The edit was more to show how to incorporate that answer into the code, since that was apparently unclear :).
  • Ok, my mistake.
  • so apparently I need to do this without using any loops and mainly using functions like .islower() , .isdigit() , isalnum() etc.. and I have no idea how I can check if a string contains lower case letters and numbers only , without using loops or something that will check every single char in the string . we only started to learn the basics in python so they told us we can't use "for" and all that even if I know what it does.. no I can check an entire string is only digits or lower/upper case letters but I don't know how to check the two conditions mentioned above in the simplest way possible