1. dura regex sed regex
por wairton de abreu

2. 2

3. 3
Stephen Cole Kleene
(1909 - 1994)
o que é uma expressão regular?

4. 4
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']

5. 5
import re
['A', '_alphanum_str', 'ASCII', 'fullmatch', '__loader__', 'copyreg',
'__cached__', '_alphanum_bytes', '__spec__']

6. 6
o básico (parte 1) ? * + .
“pessoas?” “faz(em)?”
“go+l” “gol” “goooooooooool”-> ou

7. 7
.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.

8. 8
Pattern → compile → Match
>>> pattern = re.compile("andr[eé](ia)?")
>>> match = pattern.match("andreia")
>>> match.group()
'andreia'

9. 9
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]

10. 10
a barra e o r
section → section → section → r“section”

11. 11
o básico (parte 2) | [ ] ( ) { } ^ $

12. 12
(?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 ..."

14. 14
.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.

15. 15
.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...

16. 16
a classe Match
['end', 'endpos', 'expand', 'group', 'groupdict', 'groups',
'lastgroup', 'lastindex', 'pos', 're', 'regs', 'span', 'start', 'string']

17. 17
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

18. 18
grupos
>>> p = re.compile('(a(b)c)d')
>>> m = p.match('abcd')
>>> m.group(0)
'abcd'
>>> m.group(1)
'abc'
>>> m.group(2)
'b'

19. 19
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'),
]

20. 20
o que faltou?
quantificadores possessivos
lookahead e lookbehind
backreference

21. 21
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

22. 22
?