Python Regular common functions

Compile compiles faster, FindAll returns a matching list

>>> Import re

>>> r=r ' a[bcd]e '

>>> P=re.compile (R)

>>> print P.findall (' Abe,ace,ade,afe ')

[' Abe ', ' Ace ', ' Ade ']

>>> Print Re.findall (R, ' Abe,ace,ade,afe ')

[' Abe ', ' Ace ', ' Ade ']

>>>

Finditer returns a matching iterator

>>> Print Re.finditer (R, ' Abe,ace,ade,afe ')

<callable-iterator Object at 0x02c5ca90>

The match matches the string beginning with the first matched content returned

>>> r=r ' (a[bcd]e) ' #注意使用match和search时需要分组

>>> Res=re.match (R, ' Abe,ace,ade,afe ')

>>> Print res.groups ()

(' Abe ',)

>>> Res=re.match (R, ' Afe,abe,ace,ade ')

>>> Print Res

None

>>>

Search matches string full-text and returns the first matching content

>>> Res=re.search (R, ' Afe,abe,ace,ade ')

>>> Print Res

<_sre. Sre_match Object at 0x02c5ee60>

>>> Print res.groups ()

(' Abe ',)

>>>

Sub string regular substitution, return replacement string

>>> re.sub (R ' a). d ', ' python ', ' ABCD,AEFDQ,QANMD ')

' Python,pythonq,qpython '

>>>

Subn string Regular substitution, returns a tuple (replacement string, number of replacements)

>>> re.subn (R ' a). d ', ' python ', ' ABCD,AEFDQ,QANMD ')

(' Python,pythonq,qpython ', 3)

>>>

Split returns the list after cut

>>> Re.split (R ' \+ ', "12+34*56/78")

[' 12 ', ' 34*56/78 ']

>>> Re.split (R ' [\+\-\*\/] ', "12+34*56/78")

[' 12 ', ' 34 ', ' 56 ', ' 78 ']

>>>

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Python Regular common functions