How can I use regular expressions in Python to choose the string that comes after another string?

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You can use the re.search() function from the Python regular expression module to find the pattern that matches the string after another string.

Here's an example code snippet:

import re

# the text you want to search
text = "I have a cat and a dog"

# the string you want to search for
search_string = "have a"

# use regular expressions to find the string after the search string
result = re.search(search_string + r"\s(\w+)", text)

# print the result
print(result.group(1)) # output: cat

In this example, we use the search_string variable along with the \s character to match the space between the search string and the string we want to capture. The (\w+) captures any word characters that come after the space. The group(1) method is used to extract the captured string.