Python Methods and Functions | Regular Expressions

## Books for developers

# Think Bayes: Bayesian Statistics in Python

# Practical Machine Learning with Python

# Big Data, Data Mining, and Machine Learning

# Learn Python the hard way

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** Basic conditions for password verification: **

- At least 8 characters.
- Letters must be between [az]
- At least one alphabet must be uppercase [AZ]
- At least 1 digit or digit between [0-9].
- At least 1 character from [_ or @ or $].

Examples:

Input: R @ m @ _f0rtu9e $ Output: Valid Password Input: Rama_fortune $ Output: Invalid Password Explanation: Number is missing Input: Rama # fortu9e Output: Invalid Password Explanation: Must consist from _ or @ or $

Here we have used the ** re module ** which provides support for regular expressions in Python . Along with this the re.search () method returns False (if the first parameter is not found in the second parameter). This method is best for validating a regular expression rather than extracting data. We used re.search () to check if alphabets, numbers or special characters are correct. To check for spaces, we use "/ s" which is included in the regular expression module.

Output:

Valid Password

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