Very basic python script to update form_state from Drupal 7 to Drupal 9.

form_state_update.py

#!/usr/bin/env python3

import re

filename = 'fsp_competitive_cross_reference.cut_n_paste.inc'

# Read in the file
with open(filename, 'r') as file:
    filedata = file.read()

# print(filedata)
values = re.findall("\$form_state\['values'\].*\]", filedata)
temp = re.sub(r"(\$form_state\['values'\]\[)('.*')(\])", r'$form_state->getValue(\2)', filedata)
print(temp)

regex is a bit greedy - so on line 12 your closing .] would consume all characters until the LAST ] and not the first ] (if there was more than one....)
that is why I used, (in the vim description) '[^']'
This said find a single quote, then all following characters that are NOT a single quote, then a closing single quote....
This is NOT greedy and stops at the first closing quote.

Of course, if you had perfect code and only one instance of things per line.... no problem. but coders take shortcuts sometimes and you cannot be assured that is always going to be true.

damn thing pulled my astericks.... I should have probably used somthing that indicated this was code....
regex is a bit greedy - so on line 12 your closing .*\] would consume all characters until the LAST ] and not the first ] (if there was more than one....) that is why I used, (in the vim description) '[^']*'