Python: extracting numbers from string using regex

Question

I'm having a string and trying to find all numbers such as 1, -1.5, .5, etc. I already found this question with very helpful answers. The only problem I have is that all these solution seem to match "too much". For example, the match "17" in "MH17". How can I extend any of the proposed solution so that a number cannot start with (or contain) a letter?

Can you provide valid and invalid cases of matching and what have you tried? — hwnd
– hwnd, Commented Aug 7, 2014 at 2:19

HMK · Accepted Answer · 2014-08-07 02:36:58Z

2

I rewrite the original regex: fix +/- bug and exclude the case starting with letter

(?<=\s)[+-]?\d+(?:.\d)?\d*

Also please find the demo

answered Aug 7, 2014 at 2:36

HMK

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4 Comments

The Guy with The Hat Over a year ago

+1, but you can simplify it a bit with (?<=\s)[+-]?\d+(?:.\d+)?

hwnd Over a year ago

Shouldn't you escape the dot?

HMK Over a year ago

@TheGuywithTheHat Thank you very much for the improvement.

Christian Over a year ago

Thanks a lot! This works pretty perfect for my needs!

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