5.0.1 Bug in find and replace in bulk

jbacelar · 09-29-2020, 01:49 AM

The substitution is doubled.

kovidgoyal · 09-29-2020, 07:16 AM

That's how .* has always behaved. it matches both the empty string and the character. You want .+ instead

jbacelar · 09-29-2020, 10:46 AM

Indeed, I look for anything (including the empty string), and I want it to be replaced by the correct data (in my example: pp) and not by pppp.
In previous versions of Calibre, it worked correctly.

kovidgoyal · 09-29-2020, 11:19 AM

The previous behavior was a bug, this is how regexes are supposed to behave, it was fixed in python 3 and hence also in calibre 5. For example:

Code:

python3 -c "import re; print(re.sub('.*', 'pp', 'a'))"
pppp

python2 -c "import re; print(re.sub('.*', 'pp', 'a'))"                                                
pp

kovidgoyal · 09-29-2020, 11:28 AM

And this is the search expression you use for this in python 3

Code:

^$|.+

jbacelar · 09-29-2020, 11:37 AM

Yes sir! thank you very much.

09-29-2020, 01:49 AM	#1
jbacelar Interested in the matter Posts: 421 Karma: 426094 Join Date: Dec 2011 Location: Spain, south coast Device: Pocketbook InkPad 3	5.0.1 Bug in find and replace in bulk The substitution is doubled. Attached Thumbnails

09-29-2020, 11:19 AM	#4
kovidgoyal creator of calibre Posts: 45,345 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	The previous behavior was a bug, this is how regexes are supposed to behave, it was fixed in python 3 and hence also in calibre 5. For example: Code: python3 -c "import re; print(re.sub('.', 'pp', 'a'))" pppp python2 -c "import re; print(re.sub('.', 'pp', 'a'))" pp

09-29-2020, 11:28 AM	#5
kovidgoyal creator of calibre Posts: 45,345 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	And this is the search expression you use for this in python 3 Code: ^$\|.+

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09-29-2020, 07:16 AM	#2
kovidgoyal creator of calibre Posts: 45,345 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	That's how .* has always behaved. it matches both the empty string and the character. You want .+ instead

09-29-2020, 10:46 AM	#3
jbacelar Interested in the matter Posts: 421 Karma: 426094 Join Date: Dec 2011 Location: Spain, south coast Device: Pocketbook InkPad 3	Indeed, I look for anything (including the empty string), and I want it to be replaced by the correct data (in my example: pp) and not by pppp. In previous versions of Calibre, it worked correctly.

09-29-2020, 11:37 AM	#6
jbacelar Interested in the matter Posts: 421 Karma: 426094 Join Date: Dec 2011 Location: Spain, south coast Device: Pocketbook InkPad 3	Yes sir! thank you very much.

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