String index out of range issue in

Question

I've made this simple script for practicing RegEx that is supposed to read text that I copied to the clipboard and count how many times the word "corona" is mentioned. But i keep getting

"IndexError: string index out of range" which I get at matches.append(groups[0])

which I don't understand seeing as I'm starting the index at 0.

import re
import pyperclip

coronaRegEx = re.compile(r'Corona(virus)*', re.IGNORECASE)

text = str(pyperclip.paste())
matches = []
count = sum(matches)

for groups in coronaRegEx.findall(text):
    matches.append(groups[0])

if len(matches) > 0:
    pyperclip.copy(join(matches))
    print("Found " + count + " of instances")
else:
    print("No instances found")

I guess the error comes from matches.append(groups[0]), right? That's because you might get a result from findall that is an empty string which, of course, can't be used with [0]. — garglblarg
– garglblarg, Commented Mar 13, 2020 at 17:10
I don't follow. If the result from findall is an empty string shouldn't it print "No instances found"? But it should have content though I've typed the word "corona" and copied it... — pam_param
– pam_param, Commented Mar 13, 2020 at 17:30

user8838577 · Accepted Answer · 2020-03-13 18:02:45Z

2

I don't know your approach about the problem. I have simplified into following

import re
#import pyperclip
#I don't know what clipboard pasting you are doing so I have skipped pyperclip 
text = "Corona(virus) adsfj rl Corona adfs Corona adf Corona dfsd Corona Corona(virus) dfs asdf"
matches = []

for group in re.findall('Corona[virus]*',text):
    matches.append(group)

print(matches)

if len(matches) > 0:
    print("Found " + str(len(matches)) + " of instances")
else:
    print("No instances found")

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