This document provides an introduction to regular expressions (regex) in 3 parts. It explains some basic regex patterns like *, +, ., \, defines methods like .match() and .search(), and covers special characters \d, \w, \s, character classes and barra e r. It also discusses flags, word boundaries, and methods for finding and replacing matches. Finally, it recommends resources for learning more about advanced regex features and techniques.

1. dura regex sed regex
por wairton de abreu

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Stephen Cole Kleene
(1909 - 1994)
o que é uma expressão regular?

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import re
['DEBUG', 'DOTALL', 'I', 'IGNORECASE', 'L', 'LOCALE', 'M',
'MULTILINE', 'S', 'Scanner', 'T', 'TEMPLATE', 'U', 'UNICODE',
'VERBOSE', 'X', '_MAXCACHE', '__all__', '__builtins__', '__doc__',
'__file__', '__name__', '__package__', '__version__', '_alphanum',
'_cache', '_cache_repl', '_compile', '_compile_repl', '_expand',
'_pattern_type', '_pickle', '_subx', 'compile', 'copy_reg', 'error',
'escape', 'findall', 'finditer', 'match', 'purge', 'search', 'split',
'sre_compile', 'sre_parse', 'sub', 'subn', 'sys', 'template']

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import re
['A', '_alphanum_str', 'ASCII', 'fullmatch', '__loader__', 'copyreg',
'__cached__', '_alphanum_bytes', '__spec__']

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o básico (parte 1) ? * + .
“pessoas?” “faz(em)?”
“go+l” “gol” “goooooooooool”-> ou

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.match() e .search()
match(pattern, string, flags=0)
Try to apply the pattern at the start of the string, returning
a match object, or None if no match was found.
search(pattern, string, flags=0)
Scan through string looking for a match to the pattern, returning
a match object, or None if no match was found.

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Pattern → compile → Match
>>> pattern = re.compile("andr[eé](ia)?")
>>> match = pattern.match("andreia")
>>> match.group()
'andreia'

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d, D, w, W, s e S
[a-zA-Z0-9_] [^a-zA-Z0-9_]
[ tn] [^ tn]
[a-zA-Z0-9_] [^a-zA-Z0-9_]
[0-9] [^0-9]

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a barra e o r
section → section → section → r“section”

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o básico (parte 2) | [ ] ( ) { } ^ $

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(?i) (?s)
case insensitive
o . captura quebra de linha

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b B
"eu sou um pythonista! Sim, python é melhor do que ..."

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.finditer() e .findall()
findall(pattern, string, flags=0)
Return a list of all non-overlapping matches in the string.
(...)
finditer(pattern, string, flags=0)
Return an iterator over all non-overlapping matches in the
string. For each match, the iterator returns a match object.

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.split(), .sub() e .subn()
sub(pattern, repl, string, count=0, flags=0)
Return the string obtained by replacing the leftmost
non-overlapping occurrences of the pattern in string by the
replacement repl...

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a classe Match
['end', 'endpos', 'expand', 'group', 'groupdict', 'groups',
'lastgroup', 'lastindex', 'pos', 're', 'regs', 'span', 'start', 'string']

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e o unicode?
>>> re.search("κα "," γώ ε μι δ ς κα λήθεια κα ζωή")ὶ Ἐ ἰ ἡ ὁ ὸ ὶ ἡ ἀ ὶ ἡ
<_sre.SRE_Match object; span=(16, 19), match='κα '>ὶ

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grupos
>>> p = re.compile('(a(b)c)d')
>>> m = p.match('abcd')
>>> m.group(0)
'abcd'
>>> m.group(1)
'abc'
>>> m.group(2)
'b'

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grupos nomeados
from django.conf.urls import url
urlpatterns = [
url(r'^articles/2003/$', 'news.views.special_case_2003'),
url(r'^articles/(?P<year>[0-9]{4})/$', 'news.views.year_archive'),
url(r'^articles/(?P<year>[0-9]{4})/(?P<month>[0-9]{2})/$',
'news.views.month_archive'),
]

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o que faltou?
quantificadores possessivos
lookahead e lookbehind
backreference

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para onde agora?
expressões regulares – uma abordagem divertida
expressões regulares cookbook
https://docs.python.org/3/howto/regex.html#regex-howto
https://docs.python.org/3/library/re.html
http://www.regular-expressions.info

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?