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user_none · 01-23-2011, 11:19 AM

For learning regular expressions start with what you want to replace and start replacing parts of it with regular expression characters. Meaning you have:

Code:

<div><h4>Book Author</h4><h6>Page 1 of 365</h6></div>

Start by replacing parts that change:

Code:

<div><h4>Book Author</h4><h6>Page \d{1,3} of 365</h6></div>

Then:

Code:

<div>\s*<h4>\s*Book\s*Author\s*</h4>\s*<h6>\s*Page\s*\d{1,3}\s*of\s*365</h6>\s*</div>

And so forth.

Also, the trickiest part of regular expressions is the confusion when it matches things you didn't expect it to match. calibre has a regular expression wizard in the search and replace option section that will show you all matches for your regex in the document. Use this or if you have a text editor that can highlight all matches use it. It will save you a lot of time and trouble.

01-23-2011, 11:19 AM	#7
user_none Sigil & calibre developer Posts: 2,487 Karma: 1063785 Join Date: Jan 2009 Location: Florida, USA Device: Nook STR	For learning regular expressions start with what you want to replace and start replacing parts of it with regular expression characters. Meaning you have: Code: <div><h4>Book Author</h4><h6>Page 1 of 365</h6></div> Start by replacing parts that change: Code: <div><h4>Book Author</h4><h6>Page \d{1,3} of 365</h6></div> Then: Code: <div>\s<h4>\sBook\sAuthor\s</h4>\s<h6>\sPage\s\d{1,3}\sof\s365</h6>\s</div> And so forth. Also, the trickiest part of regular expressions is the confusion when it matches things you didn't expect it to match. calibre has a regular expression wizard in the search and replace option section that will show you all matches for your regex in the document. Use this or if you have a text editor that can highlight all matches use it. It will save you a lot of time and trouble.