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Search for a string pattern inside a file

Sandeep4386

Hi,

I would like to open a file in Skill and search for a string pattern inside a file:

Pattern:"Writing initial simulation snapshot"

Is there any good example on file parsing which would help me to execute this task?

Also I know this pattern will be one of the last five lines of the file I am going to read. How do I use pattern matching to only search last few lines of the files?

Any help would be highly appreciated!

Regards,

Sandeep

Parents

  • Hi Sandeep,

    Unless the file is really really big, it is probably easiest to read it forwards (as far as I can tell, the commands for positioning the file pointer only accept byte positions, not 'line numbers' or anything relative to lines). Here's something I tried out quickly with a sample file

    
fptr = infile("/tmp/testFile")
=> port:"/tmp/testFile"
pat = pcreCompile("Writing initial simulation snapshot")
while(gets(line fptr)
  when(pcreExecute(pat line)
    printf("Found at position %L\n" fileTell(fptr))
  )
)

Found at position 156
=> t

    The "pcre" functions are more powerful and flexible than the older "rex" prefix functions, and these should be available as long as you are using IC615, IC616 or ICADV121. 

    Hopefully this helps you?

    Regards,

    Lawrence.

Reply

  • Hi Sandeep,

    Unless the file is really really big, it is probably easiest to read it forwards (as far as I can tell, the commands for positioning the file pointer only accept byte positions, not 'line numbers' or anything relative to lines). Here's something I tried out quickly with a sample file

    
fptr = infile("/tmp/testFile")
=> port:"/tmp/testFile"
pat = pcreCompile("Writing initial simulation snapshot")
while(gets(line fptr)
  when(pcreExecute(pat line)
    printf("Found at position %L\n" fileTell(fptr))
  )
)

Found at position 156
=> t

    The "pcre" functions are more powerful and flexible than the older "rex" prefix functions, and these should be available as long as you are using IC615, IC616 or ICADV121. 

    Hopefully this helps you?

    Regards,

    Lawrence.

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