Regex pattern matching in python

Question

I am trying to split the data

rest = [" hgod eruehf 10 SECTION 1. DATA: find my book 2.11.111 COLUMN: get me tea","111.2 CONTAIN  i am good"]

match = re.compile(r'(((\d[.])(\d[.]))+\s(\w[A-Z]+:|\w+))')
out = match.search(rest)
print(out.group(0))

I found the pattern as "multiple decimal digit(eg:1. / 1.1. / 1.21.1 etc.,) followed by character till another multiple decimal digit(eg:1. / 1.1. / 1.21.1 etc.,) "

I want to split the data as

DATA: find my book

2.11.111 COLUMN: get me tea

111.2 CONTAIN i am good

Is there any way to split the text data based on the pattern.

Wiktor Stribiżew · Accepted Answer · 2019-02-13 09:04:52Z

2

You may get the expected matches using

import re
rest = [" hgod eruehf 10 SECTION 1. DATA: find my book 2.11.111 COLUMN: get me tea","111.2 CONTAIN  i am good"]
res = []
for s in rest:
    res.extend(re.findall(r'\d+(?=\.)(?:\.\d+)*.*?(?=\s*\d+(?=\.)(?:\.\d+)*|\Z)', s))

print(res)
# => ['1. DATA: find my book', '2.11.111 COLUMN: get me tea', '111.2 CONTAIN  i am good']

See the Python demo

The regex is applied to each item in the rest list and all matches are saved into res list.

Pattern details

\d+ - 1+ digits
(?=\.) - there must be a . immediately to the right of the current position
(?:\.\d+)* - 0 or more repetitions of a . and then 1+ digits
.*? - 0+ chars other than newline, as few as possible
(?=\s*\d+(?=\.)(?:\.\d+)*|\Z) - up to the 0+ whitespaces, 1+ digits with a . immediately to the right of the current position, 0 or more repetitions of a . and then 1+ digits, or end of string

edited Feb 13, 2019 at 9:04

answered Feb 12, 2019 at 12:30

Wiktor Stribiżew

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7 Comments

Cybertron Over a year ago

It is not finding "1. DATA:" in string... how to make that

Wiktor Stribiżew Over a year ago

@Cybertron You have no 1. DATA.. in your string in the question. What are the exact requirements for the pattern? What type of context should it match?

Cybertron Over a year ago

Awesome!! working!! Thank you so much how can i find the logic of regex patterns please tell me

Wiktor Stribiżew Over a year ago

@Cybertron Use regex101.com or rick.measham.id.au/paste/explain.pl to see what they match.

Cybertron Over a year ago

that didn't work completely please check the pattern

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