CODEWITHSUNDEEP
pythonregex
Usi Usi
Usi Usi

Reputation: 2997

Regex to intercept integer and float in python

I'm using this regex [+-]?(\d+((\.|\,)\d*)?|(\.|\,)\d+)([eE][+-]?\d+)? against the following list of numbers:

1
1.2
1.0 
1,0

1wer,043 
1dd.44
1D

My regex matches for every example in the list posted.

This is ok for the first set (1, 1.2, 1.0, 1,1) but it also returns a match for the second set (1wer,043, 1dd.44, 1D).

How can I update my regular expression to exclude the last 3 examples?

Upvotes: 2

Views: 1303

Answers (2)

npinti
npinti

Reputation: 52185

The problem seems that you are not escaping the period character. This in turn translates to match any character. I've changed your expression to:

^[+-]?(\d+((\.|\,)\d*)?|(\.|\,)\d+)([eE][+-]?\d+)?$

which should do what you are after.

An example is available here.

The extra ^ and $ at the beginning and end respectively should ensure that the string contains only numeric data. If this is not what you are after, that is, you want to use that expression to extract numerical data, then you can simply omit them.

As per @nhahtdh's comment, your expression can be improved by putting . and , in character class:

^[+-]?(\d+([.,]\d*)?|[.,]\d+)([eE][+-]?\d+)?$

Upvotes: 1

kakabomba
kakabomba

Reputation: 341

You should use begin (^) and end ($) metacharacters

^[+-]?(\d+((.|\,)\d*)?|(.|\,)\d+)([eE][+-]?\d+)?$

Upvotes: 0

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