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Regular expression to match first occurrence of ip from an ifconfig eth0 output


Regular expression to match first occurrence of ip from an ifconfig eth0 output

By : user2185318
Date : November 21 2020, 04:01 AM
I think the issue was by ths following , I think re.match is a reasonable way to do this. One potential problem you might have had is to not use DOTALL mode. Going by your input string, the first IP address does not occur on the first line, so we want dot to match across all lines.
code :
input = "Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx\ninet addr:10.20.30.40  Bcast:10.20.30.254  Mask:255.255.255.0"

match = re.match(r'^.*?(\d+\.\d+\.\d+\.\d+)', input, re.DOTALL)

if match:
    print "first IP: ", match.group(1)

first IP:  10.20.30.40


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Regular expression to match every occurrence outside brackets?

Regular expression to match every occurrence outside brackets?


By : Prashant
Date : March 29 2020, 07:55 AM
it helps some times I have a string: , If you only want table1 outside the brackets.
code :
/table1(?=,)/
/table1[^\}]+/
Regular expression in ruby to match the text between first occurrence and last occurrence of a character

Regular expression in ruby to match the text between first occurrence and last occurrence of a character


By : Neil
Date : March 29 2020, 07:55 AM
seems to work fine This very simple regex will do (because the * operator is greedy by default):
code :
/-(.*)-/
'ruby-on-rails'[/-(.*)-/, 1]
# => "on" 
'abc-def-ghi-jkl'[/-(.*)-/, 1]
# => "def-ghi"
'mnop-qrst-uvw-xyza-bc-defg-hij-123'[/-(.*)-/, 1]
# => "qrst-uvw-xyza-bc-defg-hij"
regular expression to match everything until the last occurrence of /

regular expression to match everything until the last occurrence of /


By : user2006324
Date : March 29 2020, 07:55 AM
around this issue Using a regular expression (replaceregexp in Ant) how can I match (and then replace) everything from the start of a line, up to and including the last occurrence of a slash? , You can match this:
code :
.*\/
Capture output of ifconfig eth0 inet6 add and assign to variable

Capture output of ifconfig eth0 inet6 add and assign to variable


By : Vinutha Hosmane
Date : March 29 2020, 07:55 AM
wish of those help I decided to add another answer rather than modify my original. This approach keeps most of your original code (though it is not my style :-)
code :
ret=$( /sbin/ifconfig eth0 inet6 add $IPV6PROXYADD 2>&1 )
if [ $? -ne 0 ];
then
  returnflag="error"
  echo "$ret" >> "/root/mypath/ipv6/ipadderror.log"
fi
Regular Expression Match between occurrence of character

Regular Expression Match between occurrence of character


By : user1628250
Date : March 29 2020, 07:55 AM
seems to work fine You may use a regex like ^(?:[^#]*#){N}([^#]*) where N is the number of your required substring minus 1. To get US, which is the third value, you may use
code :
^(?:[^#]*#){2}([^#]*)
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