Lecture 97:- Add Strings RE

To concatenate (add) two strings using regular expressions (RE) in Python, you can utilize the re.sub() function with a simple regular expression pattern. The idea is to match the end of the first string and replace it with the second string.

Here's a Python code snippet to concatenate two strings using regular expressions:

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import re def add_strings_with_re(string1, string2):    # Use a regular expression to match the end of the first string (denoted by '$')    # and replace it with the second string    concatenated_string = re.sub(r'$', string2, string1)    return concatenated_string # Test the function string1 = "Hello," string2 = " World!" result = add_strings_with_re(string1, string2) print(result)

Output:

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Hello, World!

In this example, the re.sub() function takes a regular expression pattern as the first argument and the replacement pattern (i.e., string2) as the second argument. The regular expression pattern $ matches the end of the first string, and the string2 is added at that position.

Note that using regular expressions for simple concatenation like this might not be the most efficient way, as regular expressions are more suited for complex pattern matching tasks. For simple concatenation, you can directly use the + operator to concatenate two strings, like this: string1 + string2.