How to replace spaces between words using regex?

@daisha 

To replace spaces between words using regex, you can use the following steps in a programming language that supports regex, such as Python:

1. Import the re module:

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import re

1. Define a string with spaces between words:

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text = "Hello world, this is a test."

1. Use the re.sub() function to replace spaces between words with a desired character or string (e.g. replace spaces with underscores):

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new_text = re.sub(r's+', '_', text)
print(new_text)

In this example, the regular expression pattern 's+' matches one or more whitespace characters (including spaces, tabs, etc.) between words. The re.sub() function then replaces these whitespace characters with underscores, resulting in the output:

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Hello_world,_this_is_a_test.

You can modify the regular expression pattern and the replacement string according to your specific requirements.