[英]Python regex to find substring
示范文本
port0 interface GigabitEthernet0/4/0
port1 interface TenGigabitEthernet0/1/0
login delay 2
bfd-template single-hop BDI
ip ftp source-interface Loopback0
ip tftp source-interface Loopback0
interface Loopback0
interface Loopback100
interface Loopback999
description *** Loopback interface for management ***
interface TenGigabitEthernet0/0/0
mtu 9216
carrier-delay msec 0
interface TenGigabitEthernet0/1/0
mtu 9216
carrier-delay msec 0
interface GigabitEthernet0/4/0
mtu 9216
interface GigabitEthernet0/4/1
我的正則表達式是
[T][e]((?:.|\n)*?[e][c]\s\d+)
並在imthex.org驗證它
它匹配以下 -
TenGigabitEthernet0/1/0
mtu 9216
carrier-delay msec 0
這就是我想要的。 但它也匹配 -
TenGigabitEthernet0/1/0
login delay 2
bfd-template single-hop BDI
ip ftp source-interface Loopback0
ip tftp source-interface Loopback0
interface Loopback0
interface Loopback100
interface Loopback999
description *** Loopback interface for management ***
interface TenGigabitEthernet0/0/0
mtu 9216
carrier-delay msec 0
我不想要的。 我正在尋找一個multiline regex
,它只與我的字符串中的所有tengig-mtu-carrier-delay part(s)
完全匹配。
我寫的是 -
buffer_=open(file,"rb")
sb=buffer_.read().replace('\r\r\n','')
inf = re.compile(r'[T][e]((?:.|\n)*?[e][c]\s\d+)')
intf = inf.findall(sb)
print intf
buffer_.close()
它適用於在連續行中具有tengig-mtu-carrier-delay
文件,但不是那么完美。 如果在其他地方還有任何tengig
?
我認為這個正則表達式是你想要的
(tengig.*?(?:\n+)?\bmtu\b.*?(?:\n+)?\bcarrier-delay\b[^\n]+)
正則表達式細分
( #Capturing group
tengig #Match tengig literally
.*? #Lazy matching to meet next next requirement
(?:\n+)? #Match next \n (OPTIONAL)
\bmtu\b #Match mtu literally
.*? #Lazy matching to meet next requirement
(?:\n+)? #Match next \n (OPTIONAL)
\bcarrier-delay\b #Match carrier-delay literally
[^\n]+ #Match anything till a new line
) #End capturing group
Python代碼
p = re.compile(r'(tengig.*?(?:\n+)?\bmtu\b.*?(?:\n+)?\bcarrier-delay\b[^\n]+)', re.MULTILINE | re.IGNORECASE)
test_str = "port0 interface GigabitEthernet0/4/0\n\nport1 interface TenGigabitEthernet0/1/0\n\nlogin delay 2\n\nbfd-template single-hop BDI\n\nip ftp source-interface Loopback0\n\nip tftp source-interface Loopback0\n\ninterface Loopback0\n\ninterface Loopback100\n\ninterface Loopback999\n\ndescription * Loopback interface for management *\n\ninterface TenGigabitEthernet0/0/0\n\nmtu 9216\n\ncarrier-delay msec 0\n\ninterface TenGigabitEthernet0/1/0\n\nmtu 9216\n\ncarrier-delay msec 0\n\ninterface GigabitEthernet0/4/0\n\nmtu 9216\n\ninterface GigabitEthernet0/4/1\n"
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