Possible RegEx error in Sigil (minimal match being ignored)

KarlG · 08-18-2024, 10:45 AM

Hello,

I'm trying to delete all 'span' tags with no content (i.e. (nothing here) by using the following RegEx (with minimal match enabled)



Here is some example text which shouldn't match anything

<hgroup><h2 class="CHAPTER" id="ch1"><samp class="SANS_Futura_Std_Bold_Condensed_B_11">1</samp> <samp class="SANS_Dogma_OT_Bold_B_11">WINDOWS FOUNDATIONAL CONCEPTS</samp></h2></hgroup>

As we can see, there are no span tags without content. Running this RegEx however matches the following text (as can be seen in the attached screenshot)
<samp class="SANS_Futura_Std_Bold_Condensed_B_11">1</samp>

Is there anything I have missed, or is this indeed an error?

Rgds

Karl

Doitsu · 08-18-2024, 12:29 PM

The .* in your regular expression also matches other tags. The following expression should work:

Code:

<span[^>]*></span>

KarlG · 08-18-2024, 12:34 PM

Quote:

Originally Posted by Doitsu

The .* in your regular expression also matches other tags. The following expression should work:

Code:

<span[^>]*></span>

But surely when 'minimal match' is selected, the search should also stop with the first '>'.?

DiapDealer · 08-18-2024, 02:02 PM

Nope. Minimal Match can't affect the inherent greediness of *.

At least I don't recall it doing so in the past.

KarlG · 08-18-2024, 02:12 PM

Quote:

Originally Posted by DiapDealer

Nope. Minimal Match can't affect the inherent greediness of *.

At least I don't recall it doing so in the past.

Hmm, maybe confusion on my part here then.

So what IS 'minimal match' for then, and what's the option (if there is one) for a non-greedy RegEx in Sigil?

DiapDealer · 08-18-2024, 02:29 PM

Doitsu's regex was an example of a non-greedy search. But let me do some investigation. I don't really use the Minimal Match option, so there could be a problem with it. I don't want to be too nasty in dismissing what might be a bug.

KevinH · 08-18-2024, 02:38 PM

And no the text search will only stop at the first ">" when a match is found, without a match it will continue to grow the search area until it finds the first match or none at all. That is what the "minimal match" flag means. It finds the minimal length match if one exists.

DNSB · 08-18-2024, 03:40 PM

Personally, I find it easier to use @DiapDealer's TagMechanic plugin for this type of task. Saves me from the issues when my fat fingers cause a typo,

08-18-2024, 10:45 AM	#1
KarlG Connoisseur Posts: 62 Karma: 10 Join Date: Mar 2024 Device: none	Possible RegEx error in Sigil (minimal match being ignored) Hello, I'm trying to delete all 'span' tags with no content (i.e. <span blah blah>(nothing here)</span> by using the following RegEx (with minimal match enabled) <span .></span> Here is some example text which shouldn't match anything <hgroup><h2 class="CHAPTER" id="ch1"><span class="CN"><samp class="SANS_Futura_Std_Bold_Condensed_B_11">1</samp></span> <span class="CT"><samp class="SANS_Dogma_OT_Bold_B_11">WINDOWS FOUNDATIONAL CONCEPTS</samp></span></h2></hgroup> As we can see, there are no span tags without content. Running this RegEx however matches the following text (as can be seen in the attached screenshot) <span class="CN"><samp class="SANS_Futura_Std_Bold_Condensed_B_11">1</samp></span>* Is there anything I have missed, or is this indeed an error? Rgds Karl Attached Thumbnails

08-18-2024, 12:29 PM	#2
Doitsu Grand Sorcerer Posts: 5,640 Karma: 23191067 Join Date: Dec 2010 Device: Kindle PW2	The .* in your regular expression also matches other tags. The following expression should work: Code: <span[^>]*></span>

08-18-2024, 02:02 PM	#4
DiapDealer Grand Sorcerer Posts: 28,039 Karma: 199464182 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	Nope. Minimal Match can't affect the inherent greediness of . At least I don't recall it doing so in the past. Last edited by DiapDealer; 08-18-2024 at 02:07 PM.*

08-18-2024, 02:38 PM	#7
KevinH Sigil Developer Posts: 8,156 Karma: 5450818 Join Date: Nov 2009 Device: many	And no the text search will only stop at the first ">" when a match is found, without a match it will continue to grow the search area until it finds the first match or none at all. That is what the "minimal match" flag means. It finds the minimal length match if one exists. Last edited by KevinH; 08-21-2024 at 06:40 PM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
match an empty line with a regex?	lumpynose	Sigil	5	05-29-2019 04:03 AM
REGEX match everything before #	JLius	ePub	2	01-08-2017 05:25 PM
[Regex Search] Minimal match not possible?	nqk	Editor	7	12-24-2014 04:19 AM
how to have regex dot match any character including newline?	gnychis	Calibre	5	11-30-2010 07:35 PM
Need help with a conversion regex - can't match newline	ereader123	Calibre	2	03-29-2010 11:58 AM

08-18-2024, 02:29 PM	#6
DiapDealer Grand Sorcerer Posts: 28,039 Karma: 199464182 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	Doitsu's regex was an example of a non-greedy search. But let me do some investigation. I don't really use the Minimal Match option, so there could be a problem with it. I don't want to be too nasty in dismissing what might be a bug.

08-18-2024, 03:40 PM	#8
DNSB Bibliophagist Posts: 40,475 Karma: 156982136 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	Personally, I find it easier to use @DiapDealer's TagMechanic plugin for this type of task. Saves me from the issues when my fat fingers cause a typo,

Advert

Advert