Doubt on Regular Expression

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Doubt on Regular Expression

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#1 by (2 votes)

1

Good evening, everyone.

I would like to know a regular expression to get the following information:

Numbering and title of a chapter.

Example:

INTRODUCTION

number = 1.

title = INTRODUCTION

1.1. GENERAL OBJECTIVE

number = 1.1.

title = GENERAL OBJECTIVE

1.2. SPECIFIC OBJECTIVE

number = 1.2.

title = SPECIFIC OBJECTIVE

I need this to generate a table of contents in the following format:

| INTRODUCTION | PAGE

1.1. | GENERAL OBJECTIVE | PAGE

1.2. | SPECIFIC OBJECTIVE | PAGE

That is, the regular expression should be able to recognize numbers followed by periods in the following generic format:

Primary Title = > x.

Secondary Title = > x.x.

Tertiary Title = > x.x.x.

Quaternary title = > x.x.x.x.

And so on.

I thank you for your attention. Hugs to all.

regex

asked by anonymous 25.01.2017 / 02:15

1 answer

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score 2 · Accepted Answer

This regular expression here solves:

"^\s*?(?P<numero>(\d\.)+)\s*(?P<titulo>.*)$"

You did not say which tool to use to apply the regular expression - this might have something specific to Python regular expressions - where I tested it. The documentation is at: link

At an interactive Python 3.5 prompt:

In [47]: import re

In [48]: a = """
    ...: 1.INTRODUÇÃO
    ...: número = 1.
    ...: 
    ...: título = INTRODUÇÃO
    ...: 
    ...: 1.1. OBJETIVO GERAL
    ...: 
    ...: número = 1.1.
    ...: título = OBJETIVO GERAL
    ...: 
    ...: 1.2. OBJETIVO ESPECÍFICO
    ...: 
    ...: 1.2.1. Detalhamento
    ...: 2. Outro Capítulo
    ...: """

In [49]: [(m.group('numero'), m.group('titulo')) for m in re.finditer(r"^\s*?(?P<numero>(\d\.)+)\s*(?P<titulo>.*)$", a, re.MULTILINE) ]
Out[49]: 
[('1.', 'INTRODUÇÃO'),
 ('1.1.', 'OBJETIVO GERAL'),
 ('1.2.', 'OBJETIVO ESPECÍFICO'),
 ('1.2.1.', 'Detalhamento'),
 ('2.', 'Outro Capítulo')]

(The function re.finditer returns a match object iterator - which in turn has a group method that can be called with the desired group name. The group names in turn are given within the regular expression itself, using the (?P<nome>...) construct) This part of the group names should be the only thing that changes if the regexp tool you use is different from the Python regexps.)