for i inrange(3):
print(re.match(r"(air(craft|plane)|jet)", "airplane")[i])
#airplane #只要匹配成功,首项都是完整匹配项#airplane#planetry:
for i inrange(3):
print(re.match(r"(air(?:craft|plane)|jet)", "airplane")[i]) #?:关闭捕获except IndexError as err:
print("IndexError: {0}".format(err))
#airplane#airplane#IndexError: no such group
s = "eric1 = something\n"\
"eric2 = somewhere\n"\
"eric3 = somebody"try:
for i inrange(10):
print(re.match(r"(\w+ = .+\n?)+", s)[i])
except IndexError as err:
print("IndexError: {0}".format(err))
#eric1 = something#eric2 = somewhere#eric3 = somebody#eric3 = somebody#IndexError: no such group
s = "eric1 = something\n"\
"eric2 = somewhere\n"\
"eric3 = somebody"try:
for i inrange(10):
print(re.match(r"(?:(\w+) = (.+)\n?)+", s)[i])
except IndexError as err:
print("IndexError: {0}".format(err))
#eric1 = something#eric2 = somewhere#eric3 = somebody#eric3#somebody#IndexError: no such group
re.match(r"eric", "eric1")
#<re.Match object; span=(0, 4), match='eric'>
re.match(r"eric\b", "eric1") #None
re.match(r"deric", "deric1")
#<re.Match object; span=(0, 5), match='deric'>
re.match(r"d\beric", "deric1") #None
s = "I'm sorry, my son.\n Actually, actually, she is my daughter, and your sister..."
re.match(r".+(?<=son)", s)
#<re.Match object; span=(0, 17), match="I'm sorry, my son">
s = "I'm sorry, my son.\n Actually, actually, she is my daughter, and your sister..."
re.match(r".+(?<!daugther)", s)
#<re.Match object; span=(0, 18), match="I'm sorry, my son.">
import re
re.escape("\\") #'\\\\'
s = "eric1 = something\n"\
"eric2 = somewhere\n"\
"eric3 = somebody"try:
for i inrange(10):
print(re.findall(r"(?:(\w+) = (.+)\n?)+", s)[i])
except IndexError as err:
print("IndexError: {0}".format(err))
#('eric3', 'somebody')#IndexError: list index out of range#从下面的例子可以明白什么是非交叠匹配
s = "bigbigericbigbig\n"\
"smallsmallericsmallsmall\n"\
"hardharderichardhard"
e = r"""(?x)(?i)
((?P<attr>big|small)(eric)\2)
"""
e = re.compile(e)
re.findall(e, s) #[('bigericbig', 'big', 'eric'), ('smallericsmall', 'small', 'eric')]
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