function re()

myki · 06-21-2014, 03:23 PM

Greetings,

I found in the forum, the way to replace the last point (".") from the author's firstname, like this :

Code:

{#author_sort_firstname:re([.]$,)}

First : I don't understand how it works, can you explain to me ?
(i believed that it used regex ?? and the [.] is before the $ ??)

Second : I want to do the same, but for all points in the firstname, how to do this with the re() function ?

Thanx in advance for your precious help...

theducks · 06-21-2014, 04:08 PM

Quote:

Originally Posted by myki

Greetings,

I found in the forum, the way to replace the last point (".") from the author's firstname, like this :

Code:

{#author_sort_firstname:re([.]$,)}

First : I don't understand how it works, can you explain to me ?
(i believed that it used regex ?? and the [.] is before the $ ??)

Second : I want to do the same, but for all points in the firstname, how to do this with the re() function ?

Thanx in advance for your precious help...

Look at the Quality Check Plugin: Fix has a section for formatting Author initials

myki · 06-21-2014, 04:38 PM

Thanx for your help Theducks.

In fact i am building my pattern for the "save as" option.
I want to add the author's first name without points, without changing anything in my database, that's why i need to use the "re()" function.

But the "quality check" plugin will help me for other things for sure

Thank you !

Edit : the first name doesn't need to be extracted from author_sort, because it is allready stored in my personnal field #author_sort_firstname

eschwartz · 06-22-2014, 05:36 AM

That just uses the standard python regex re() module, running the regex "[.]$" and replacing it with "" -- the dot is surrounded by brackets to escape its special meaning as match-any-one-character, but you could do the same with "\.$" and of course, the Dollar sign matches the end-of-line border. So you are matching a dot (not any-character) followed by the end of the field.

A regex to match any dot would be "\." since it doesn't only look for the one right before the end-of-line border as indicated by "$".

In order to better understand regex, you may wish to read a tutorial, like the one here: http://www.regular-expressions.info

myki · 06-23-2014, 05:32 AM

Everything is clear now, thank you very much eschwartz

I only knew the "\" to escape a character, and i believed that the $ was to indicate a field to Calibre, like the $ in an expression like {series:'ifempty($,'{author_sort}')'}.

eschwartz · 06-23-2014, 12:09 PM

Brackets are use to create character classes, like [a-z] for lowercase letters; as such, special characters like dot-match-all have no special meaning within the brackets.

Inside a character class, only \^]- have non-literal meanings.

$ when inside a regex gets passed to the regex instead of being translated by calibre first.

myki · 06-23-2014, 06:11 PM

I see, [.] is not very "pure" but sometimes we get lost when we use a lot of \ and / so it can be useful to cheat a bit

May be you could help me with my other post, that don't seem to passionate peole lol
It's a post still about regex.
You can find it here : Change case in a regular expression

Anyway, thank you very much for the explanations, it is always better that getting the solution too fast

06-21-2014, 03:23 PM	#1
myki Zealot Posts: 126 Karma: 20236 Join Date: May 2014 Device: Kinde PW v1, Kobo H2O, Onyx Boox T68	[Solved] function re() Greetings, I found in the forum, the way to replace the last point (".") from the author's firstname, like this : Code: {#author_sort_firstname:re([.]$,)} First : I don't understand how it works, can you explain to me ? (i believed that it used regex ?? and the [.] is before the $ ??) Second : I want to do the same, but for all points in the firstname, how to do this with the re() function ? Thanx in advance for your precious help... Last edited by myki; 06-23-2014 at 05:33 AM.

06-22-2014, 05:36 AM	#4
eschwartz Ex-Helpdesk Junkie Posts: 19,421 Karma: 85397180 Join Date: Nov 2012 Location: The Beaten Path, USA, Roundworld, This Side of Infinity Device: Kindle Touch fw5.3.7 (Wifi only)	That just uses the standard python regex re() module, running the regex "[.]$" and replacing it with "" -- the dot is surrounded by brackets to escape its special meaning as match-any-one-character, but you could do the same with "\.$" and of course, the Dollar sign matches the end-of-line border. So you are matching a dot (not any-character) followed by the end of the field. A regex to match any dot would be "\." since it doesn't only look for the one right before the end-of-line border as indicated by "$". In order to better understand regex, you may wish to read a tutorial, like the one here: http://www.regular-expressions.info Last edited by eschwartz; 06-22-2014 at 05:39 AM.

06-23-2014, 12:09 PM	#6
eschwartz Ex-Helpdesk Junkie Posts: 19,421 Karma: 85397180 Join Date: Nov 2012 Location: The Beaten Path, USA, Roundworld, This Side of Infinity Device: Kindle Touch fw5.3.7 (Wifi only)	Brackets are use to create character classes, like [a-z] for lowercase letters; as such, special characters like dot-match-all have no special meaning within the brackets. Inside a character class, only \^]- have non-literal meanings. $ when inside a regex gets passed to the regex instead of being translated by calibre first. Last edited by eschwartz; 06-23-2014 at 12:18 PM.

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06-21-2014, 04:38 PM	#3
myki Zealot Posts: 126 Karma: 20236 Join Date: May 2014 Device: Kinde PW v1, Kobo H2O, Onyx Boox T68	Thanx for your help Theducks. In fact i am building my pattern for the "save as" option. I want to add the author's first name without points, without changing anything in my database, that's why i need to use the "re()" function. But the "quality check" plugin will help me for other things for sure Thank you ! Edit : the first name doesn't need to be extracted from author_sort, because it is allready stored in my personnal field #author_sort_firstname

06-23-2014, 05:32 AM	#5
myki Zealot Posts: 126 Karma: 20236 Join Date: May 2014 Device: Kinde PW v1, Kobo H2O, Onyx Boox T68	Everything is clear now, thank you very much eschwartz I only knew the "\" to escape a character, and i believed that the $ was to indicate a field to Calibre, like the $ in an expression like {series:'ifempty($,'{author_sort}')'}.

06-23-2014, 06:11 PM	#7
myki Zealot Posts: 126 Karma: 20236 Join Date: May 2014 Device: Kinde PW v1, Kobo H2O, Onyx Boox T68	I see, [.] is not very "pure" but sometimes we get lost when we use a lot of \ and / so it can be useful to cheat a bit May be you could help me with my other post, that don't seem to passionate peole lol It's a post still about regex. You can find it here : Change case in a regular expression Anyway, thank you very much for the explanations, it is always better that getting the solution too fast

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