Edit Book: ERROR: Unhandled exception

[chaot]

What's going on there!?


ERROR: Unhandled exception

Error Report

calibre, version 2.76.0
ERROR: Unhandled exception: <b>IndexError</b>:no such group

calibre 2.76 embedded-python: True is64bit: True
Linux-4.4.0-57-generic-x86_64-with-debian-stretch-sid Linux ('64bit', 'ELF')
('Linux', '4.4.0-57-generic', '#78-Ubuntu SMP Fri Dec 9 23:50:32 UTC 2016')
Python 2.7.9
Linux: ('debian', 'stretch/sid', '')
Successfully initialized third party plugins: DeDRM (6, 0, 8) && Diaps Editing Toolbag (0, 3, 2) && Wiki Reader (2, 1, 0) && Hello World Plugin (1, 0, 0)
Traceback (most recent call last):
File "site-packages/calibre/gui2/tweak_book/boss.py", line 946, in search
File "site-packages/calibre/gui2/tweak_book/search.py", line 1434, in run_search
File "site-packages/calibre/gui2/tweak_book/search.py", line 1358, in do_replace
File "site-packages/calibre/gui2/tweak_book/editor/widget.py", line 303, in replace
File "site-packages/calibre/gui2/tweak_book/editor/text.py", line 502, in replace
IndexError: no such group

[theducks]

I saw no captures ( ) in search
also when searching for REGEX controls they need to be escaped:

\\1 through
\. \. \.

and there may be a bug as I would have expected 'Not Found' instead of a crash

[gbm]

Originally Posted by theducks

I saw no captures ( ) in search
also when searching for REGEX controls they need to be escaped:

\\1 through
\. \. \.

and there may be a bug as I would have expected 'Not Found' instead of a crash

What the Ducks said also you forgot to use Regex search mode.

bernie

[theducks]

Originally Posted by gbm

What the Ducks said also you forgot to use Regex search mode.

bernie

he is doing a Normal search and a Normal replace

There are no captures and \1 is just literal

[gbm]

Originally Posted by theducks

he is doing a Normal search and a Normal replace

There are no captures and \1 is just literal

By habit I just use Regex when REGEX controls are involved.


bernie

[kovidgoyal]

Normal searches are converted into regexes internally, so you have to use a double backslash in the replace expression, i.e. use

\\1 -

[chaot]

Special characters (so-called metacharacters) are certain characters with special meanings and have to be escaped with a backslash, if used as literal character.

There are 12 metacharacters, backslash \ is one of them.

(Escaping rules can get tricky. I didn't test the other 11 mCH.)

[phossler]

Originally Posted by kovidgoyal

Normal searches are converted into regexes internally, so you have to use a double backslash in the replace expression, i.e. use

\\1 -

I didn't know that either. Is it in the manual?

Possibly when a user is in [Normal] search mode and enters a backslash or other escape-able character, Calibre could change the search and replace terms internally to be compatible with he internal RE engine?

Not knowing the 'trick' could lead to a lot of head scratching

[chaot]

I don't know if that can help you, but: calibre is written in Python (rather sure), so things get handled the special 'Python' way. Look here → Strings, Backslashes and Regular Expressions

[kovidgoyal]

Originally Posted by phossler

I didn't know that either. Is it in the manual?

Possibly when a user is in [Normal] search mode and enters a backslash or other escape-able character, Calibre could change the search and replace terms internally to be compatible with he internal RE engine?

Not knowing the 'trick' could lead to a lot of head scratching

It already does for search strings, just not for replace strings, because it is pretty rare, basically only \<digit> and a couple of other forms are special.