An example Analysis of the comparison of text search efficiency between Python and sed,grep

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Test text: 20w lines, 21m large

Python normal regular matching:

#! / usr/bin/python3

Import re

F=open ('/ tmp/test.txt')

For line in f:

Match=re.findall ('^ This.*want',line)

If match! = []:

Print (match)

Results:

Try the compiled regular:

The code is as follows:

#! / usr/bin/python3

Import re

F=open ('/ tmp/test.txt')

Re_obj=re.compile ('^ This.*want')

For line in f:

Match=re_obj.findall (line)

If match! = []:

Print (match)

The result is twice as fast:

Try sed:

It's an order of magnitude faster!

Finally, try grep:

Sure enough, grep is looking for the most professional!

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