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Regular expression allowing certain set of characters

Basics of Regular Expressions in Python, check the link below 👇 👇
Regular Expressions Regex basic in Python 👈 👈

Also with table of contents about symbols and their usage in Regex

you can also use regex to split string. Scroll down for more!!!👇 👇

Python makes regular expressions available through the re module.

If you want to check that a string contains only a certain set of characters, in this case a-z, A-Z and 0-9, you can do so like this,

import re
def is_allowed(string):
characherRegex = re.compile(r'[^a-zA-Z0-9.]')
string = characherRegex.search(string)
return not bool(string)
print (is_allowed("abyzABYZ0099"))
# Output: 'True'

print (is_allowed("#*@#$%^"))
# Output: 'False'

OUTPUT:
True
False

You can also adapt the expression line from [^a-zA-Z0-9.] to [^a-z0-9.] , to disallow uppercase letters for
example.

ILLUSTRATION

Executed using python3

Splitting a string using regular expressions

You can also use regular expressions to split a string. For example,

import re
data = re.split(r'\s+', 'James 94 Samantha 417 Scarlett 74')
print( data )

Output: [ ‘James’, ’94’, ‘Samantha’, ‘417’, ‘Scarlett’, ’74’ ]

ILLUSTRATION ON CLI

Executed using python3

Replacing Strings using Regex Python
Replacements can be made on strings using re.sub. 👇 👇 👇
Replacing Strings using Regular Expression Regex in Python..-FcukTheCode.com
Replacing strings and Using group references Replacements with a small number of groups can be made.

The re.search() method takes a regular expression pattern and a string and searches for that pattern within the string. If the search is successful, search() returns a match object or None otherwise.
For the second part in using regular expression and searching the string
visit –> Searching – Regular Expressions (Regex) in Python

Morae Q!

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  10. Find the numbers divisible by a input numbers within the given range.
  11. Change the behaviour of the Regular Expression using flags.
  12. Find the exponentiation of a number.
  13. Find all prime numbers in a range using Sieve of Eratosthenes.
  14. Convert decimal equivalent into binary, hexadecimal and octal.
  15. Compute the area of a farmers field in feet.
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  17. Precompiled patterns using Regular Expressions .
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  19. Compute the number of possible non-increasing arrays.
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