Regex does not work as expected in interpreter

Question

I want to search through a string and find units in fahrenheit and convert them into celcius.

To do this, my approach is to user regex to find units in fahrenheit in a given string, and if I find any, get the number and convert it into celcius.

This is the regex I have come up with:

regexp = re.compile("\d+(.*?)(\bfahrenheit\b|\bf\b)", re.IGNORECASE)

And here is the regex in action.

On the Pythex site it seems to work OK, however, in my interpreter the same regex does not match anything.

Any suggestions?

Answer 1

You need to use a raw string, or \b will mean "backspace" instead of "word boundary":

regexp = re.compile(r"\d+(.*?)(\bfahrenheit\b|\bf\b)", re.IGNORECASE)