Search a string after a specific string, then edit the line

Mukesh Patel 0
Viewed 37

Can someone suggest me how to do this? I need to search for "go_bit", then next "desc" and whichever line has "desc" I need to add (DO_NOT_CHECK) at the end of line before "; For example:

go_bit_l_field CPU_HRST_L[7:7] = 1'h1; CPU_HRST_L->name = "CPU_HRST_L"; CPU_HRST_L->desc = "CPU_HRST_L value. Setting this to 0 will hard reset the CPU clearing the register/memory contents. This bits is self deasserts to a value of 1 in the following clock cycle";

I need to do:

go_bit_l_field CPU_HRST_L[7:7] = 1'h1; CPU_HRST_L->name = "CPU_HRST_L"; CPU_HRST_L->desc = "CPU_HRST_L value. Setting this to 0 will hard reset the CPU clearing the register/memory contents. This bits is self deasserts to a value of 1 in the following clock cycle (DO_NOT_CHECK)";

There can be multiple similar cases in same file and there are so many files having similar case. Also, note, except "got_bit" and "desc" rest of the things will be different for each case so only those two key words need to be used.

Thanks for your help.

next add search replace string
2 Answers

This is a python script that will find the go_bit and desc field and then insert (DO_NOT_CHECK) before the last quotation mark.

Edit: I have added an example of how you can open a file modify all the contents with this regex, and then write the output back to the file.

filename.txt

go_bit_l_field CPU_HRST_L[7:7] = 1'h1; CPU_HRST_L->name = "CPU_HRST_L"; CPU_HRST_L->desc = "CPU_HRST_L value. Setting this to 0 will hard reset the CPU clearing the register/memory contents.  This bits is self deasserts to a value of 1 in the following clock cycle";
DONT REPLACE! = 1'h1; CPU_HRST_L->name = "CPU_HRST_L"; CPU_HRST_L->desc = "CPU_HRST_L value. Setting this to 0 will hard reset the CPU clearing the register/memory contents.  This bits is self deasserts to a value of 1 in the following clock cycle";
go_bit_REPLACE CPU_HRST_L[7:7] = 1'h1->desc = "TEST";

replace_script.py

import re
    
# Example of how to read a file and replace the contents with the updated text
text = ""
    
with open("filename.txt", 'r') as f:
  text = f.read()
    
new_text = re.sub(r'(go_bit.*desc = ".*)";', r'\1 (DO_NOT_CHECK)";', text)
    
with open("filename.txt", 'w') as f:
  f.write(new_text)

filename.txt after running replace_script.py

go_bit_l_field CPU_HRST_L[7:7] = 1'h1; CPU_HRST_L->name = "CPU_HRST_L"; CPU_HRST_L->desc = "CPU_HRST_L value. Setting this to 0 will hard reset the CPU clearing the register/memory contents.  This bits is self deasserts to a value of 1 in the following clock cycle (DO_NOT_CHECK)";
DONT REPLACE! = 1'h1; CPU_HRST_L->name = "CPU_HRST_L"; CPU_HRST_L->desc = "CPU_HRST_L value. Setting this to 0 will hard reset the CPU clearing the register/memory contents.  This bits is self deasserts to a value of 1 in the following clock cycle";
go_bit_REPLACE CPU_HRST_L[7:7] = 1'h1->desc = "TEST (DO_NOT_CHECK)";
JRose0

In Common Lisp, this is nearly a one liner (but I formatted the code below in the standard way to avoid too lengthy lines), using the go-to regular expression library cl-ppcre in that ecosystem.

(defun annotate-go-bit-descriptors (text annotation)
  (cl-ppcre:regex-replace-all
   "(go_bit.*desc.*)\";"
   text
   (format nil "\\1 ~a\";" annotation)))

You will notice, that I used the same regular expression as I did in my text comment about emacs below your question.

BitTickler0
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