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Old 12-16-2011, 01:19 AM   #1
David Kudler
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Question Regular expressions - Single back-reference, multiple instances?
I have a huge scanned file (500,000+ words) I'm converting into an ebook. I've got the text more or less converted. I'm now dealing with nearly a thousand footnotes. I don't want to have to hand-code all of the buggers so that they link from the reference to the note and back. I've got all of the note references with code ready to go--they all currently read
Code:
<sup><a href="" name"">NUMBER</a></sup>
(where NUMBER is, obviously, an integer -- the note number).

What I want to do is use a regular expression to help fill in the blanks, so that it looks like this:

Code:
<sup><a href="../Text/Foreword.xhtml#noteNUMBER" name="refNUMBER">NUMBER</a></sup>
Here's the search I tried:

Code:
<sup><a href="" name="">(.*)</a></sup>
And here's my attempted regex:

Code:
<sup><a href="../Text/Foreword.xhtml#note\1" name="ref\1">\1</a></sup>
Unfortunately, when I do get it to work at all, it only finds the first footnote, and munges the code:

Code:
<sup><a href="../Text/Foreword.xhtml#note1"</a></sup>
Any suggestions? Help?

ETA: Okay. Forgot the ? to make the asterisk lazy:

Code:
<sup><a href="" name="">(.*?)</a></sup>
But now the search just crashes the application.
Last edited by David Kudler; 12-16-2011 at 02:26 AM.
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Old 12-16-2011, 02:36 AM   #2
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Your code works fine in my small test case.

Try the following. Probably better, more smart ways will be placed below my answer, but it should work:

find:
<sup><a href="" name="">([0-9]{1,})</a></sup>

replace:
<sup><a href="../Text/Foreword.xhtml#note\1" name="ref\1">\1</a></sup>

I tested it in Sigil 0.4.9.02 and there it works. However, I must point out that in your initial code there is missing an equal sign in the name part.
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Old 12-16-2011, 04:17 AM   #3
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Do not use "name", it's not supported in XHTML, use "id" instead.
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Old 12-16-2011, 01:06 PM   #4
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of course, missed that one.
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Old 12-16-2011, 02:28 PM   #5
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Thanks both!

I also forgot to escape out the periods in the file address, which may have been causing the crashing. Catastrophic back-reference?

And it took me a while to figure out that I needed to edit the search term to (\d{3}) instead of just {1}. Too many darn notes. ;-)
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Old 12-16-2011, 02:41 PM   #6
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So... What seems to be causing the crashing is an inclusion of angle brackets: > or <. Which is kind of a pain.

Sigil has choked and crashed on a number of variations on this search:

Code:
(\d{3})</a>
Am I missing something?
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Old 12-16-2011, 02:57 PM   #7
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Quote:
Originally Posted by David Kudler View Post
So... What seems to be causing the crashing is an inclusion of angle brackets: > or <. Which is kind of a pain.
If you're using the beta, this has been fixed

Quote:
Originally Posted by David Kudler View Post
Code:
(\d{3})</a>
Am I missing something?
That works fine here, might be related to the previous bug however, if you're using the beta.
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Old 12-16-2011, 03:59 PM   #8
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Hmm. I'm using 4.902, which I didn't think was still in beta.
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Old 12-16-2011, 05:37 PM   #9
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Yup. Switched back to 4.2 and all was well. Eesh.
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Old 12-16-2011, 05:46 PM   #10
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Strange, because I actually tested my string on the beta release.
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Old 12-17-2011, 12:05 PM   #11
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FWIW, I was running 4.902 on a MacBook Pro 2.16GHz (4GB) under OS X 10.7.2.
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