How to handle strings that contain negative numbers using regex?

@lew 

To handle strings that contain negative numbers using regex, you can create a regular expression that matches the negative sign (-) followed by one or more digits. Here is an example of a regex pattern that can match negative numbers:

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-?d+

This pattern matches an optional negative sign followed by one or more digits. You can use this regex pattern in your code to match and extract negative numbers from strings. Here is an example in Python:

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import re

text = "The temperature is -5 degrees Celsius."

matches = re.findall(r'-?d+', text)

for match in matches:
    print(match)

In this example, the re.findall() function is used to find all negative numbers in the text. The regex pattern -?d+ is used to match negative numbers in the text. The re.findall() function returns a list of all matches found in the text. You can iterate through the list to access each negative number found in the text.