Extract specific format from a string, regex, python

Question

DESCRIPTION:

I have a string with a word, a number, bracket, and a letter inside the bracket.

QUESTION:

I want to extract only the numbers with decimal and the bracket with a letter in it.

EXAMPLE:

, INC., 5.5(b) -------> 5.5(b)

Section 13.2(k)(ii) ---------> 13.2(k)(ii)

WBNEOGNOFD.)! 82.3(b)(k)(ix) -----------> 82.3(b)(k)(ix)

ATTEMPT I MADE:

Find the first number then the decimal, followed by '('. But, sometimes, its only 1 number and no brackets after the decimal.

SOLUTION I THINK WOULD SOLVE BUT I COULD NOT SOLVE IT:

curly brace repetition qualifiers {} to match exactly three alphabetic characters and exactly four numeric characters. I tried the answer given by Christian Dean to solve for my regex, but it did not give an accurate result. (Extract string with specific format)

When there are no brackets after the decimal, do you want a match or not? — CertainPerformance
– CertainPerformance, Commented Oct 8, 2018 at 15:21
@CertainPerformance: Anything would work. To match it or not, unless it can identify that pattern. — Raj Mehta
– Raj Mehta, Commented Oct 8, 2018 at 15:23
@depperm: search('\d.\d{2}([a-zA-Z])', string). We use /d to find any digit, what do we use to identify a decimal, or a bracket? — Raj Mehta
– Raj Mehta, Commented Oct 8, 2018 at 15:26

CertainPerformance · Accepted Answer · 2018-10-08 15:24:57Z

1

To match digits with decimals followed by groups of ()s, you can use

\d+\.\d+(?:\(\w+\))+

https://regex101.com/r/wqYZr9/1

\d+\.\d+ - Match a decimal number
(?:\(\w+\))+ - Repeat a group of word characters in parentheses

answered Oct 8, 2018 at 15:24

CertainPerformance

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8 Comments

Raj Mehta Over a year ago

Is it possible to extract a single digit?

CertainPerformance Over a year ago

You mean, don't match decimal numbers or numbers greater than 9? I guess you could lookbehind for a space or the start of the string or something, something like (?<= )\d(?:\(\w+\))+ Not sure exactly what you're looking for

Raj Mehta Over a year ago

For example, using your regex, I could not extract if the string was "Article 7". Is it possible to extract that '7', if the string has no decimal and only a digit?

CertainPerformance Over a year ago

If the string contains only a single digit and you want to match that digit, just use \d

Raj Mehta Over a year ago

Yeah. But what if it needs either a single digit or a group of it (Just the way it is described above)?

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