Regex to convert to Uppercase

[Karellen]

Hi,

I am using the Calibre book editor and I am trying to convert the first letter of the chapter headings from lowercase to uppercase.

My search regex is...

PHP Code:

<p class="calibre_3" id=".*?"><span class="calibre2"><span class="bold">(\w)(.*?)</span></span></p> 


My replace regex is...

PHP Code:

<h2>\U\1\E\2</h2> 


But I keep getting the following error message...
calibre, version 5.32.0

Spoiler:

ERROR: Unhandled exception: <b>error</b>:incomplete escape \U at position 7

calibre 5.32 embedded-python: True is64bit: False
Windows-10-10.0.19041 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '10', '10.0.19041')
Python 3.8.5
Windows: ('10', '10.0.19041', '', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 45, 0) && Package KFX (from KFX Input) (1, 45, 0) && EpubCheck (0, 2, 3) && KFX metadata reader (from KFX Input) (1, 45, 0) && KFX Input (1, 45, 0) && Set KFX metadata (from KFX Output) (1, 57, 0) && KFX Output (1, 57, 0) && Kindle Collections (1, 7, 29) && && Kobo Utilities (2, 14, 1) && Manage Series (1, 2, 11) && ScrambleEbook (0, 4, 5)
Traceback (most recent call last):
File "calibre\gui2\tweak_book\boss.py", line 1114, in search
File "calibre\gui2\tweak_book\search.py", line 1561, in run_search
File "calibre\gui2\tweak_book\search.py", line 1468, in do_replace
File "calibre\gui2\tweak_book\editor\widget.py", line 329, in replace
File "calibre\gui2\tweak_book\editor\text.py", line 598, in replace
File "regex\regex.py", line 684, in _compile_replacement_helper
File "regex\_regex_core.py", line 1690, in _compile_replacement
File "regex\_regex_core.py", line 1757, in parse_repl_hex_escape

I can't see where I am going wrong. Does anybody know?

Thanks

[kovidgoyal]

There is no \U operator in calibre's regex engine. You should use function mode: https://manual.calibre-ebook.com/function_mode.html

[Karellen]

Originally Posted by kovidgoyal

There is no \U operator in calibre's regex engine. You should use function mode: https://manual.calibre-ebook.com/function_mode.html

Oh, right. Thanks @kovidgoyal

That is what I ended up doing. I used the preset regex-function for Title case.

[Doitsu]

Originally Posted by Karellen

My replace regex is...

PHP Code:

<h2>\U\1\E\2</h2> 


FYI: Sigil uses a different regex engine that supports this syntax. If you need to capitalize text other than titles, you could add Sigil to the open with menu and use it for these cases.