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Python: Matches a string that has an a followed by three 'b'

Python Regular Expression: Exercise-5 with Solution

Write a Python program that matches a string that has an a followed by three 'b'.

Sample Solution:-

Python Code:

import re
def text_match(text):
        patterns = 'ab{3}?'
        if re.search(patterns,  text):
                return 'Found a match!'
        else:
                return('Not matched!')

print(text_match("abbb"))
print(text_match("aabbbbbc"))

Sample Output: 

Found a match!                                                                                                
Found a match!

Pictorial Presentation:

Python: Regular Expression - Matches a string that has an <em>a</em> followed by three 'b'.
Python: Regular Expression - Matches a string that has an <em>a</em> followed by three 'b'.

Flowchart:

Flowchart: Regular Expression - Matches a string that has an <em>a</em> followed by three 'b'.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Python Code Editor:

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Previous: Write a Python program that matches a string that has an a followed by zero or one 'b'.
Next: Write a Python program that matches a string that has an a followed by two to three 'b'.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m