regex search for roman numerals

Blurr · 12-16-2009, 05:32 PM

I'll preface this by saying that this is the first time I've used regex.

using the expression

//h:b[re:test(., '\bX{0,2}V?I{0,3}V?X?\b')]

to search for roman numerals but it's still picking up words with an I in them like CHOICE or HOLIDAY. shouldn't the word boundry \b markers take care of that, or do they not "collapse" in when no X or V is found?

there may be a better and more efficient way to do this, but like I said, this is one of the first regex lines I've written.

Thanks

kovidgoyal · 12-16-2009, 05:36 PM

Easier to use

Code:

'[XVIL]+'

which makes use of the fact that there are no (or very few) words made up only of the letters X,V,I or L

Blurr · 12-16-2009, 05:55 PM

Heh, wow, just a tad more efficient. Still needs the \b markers though or it picks up words with an I in them. Thanks.

12-16-2009, 05:32 PM	#1
Blurr Member Posts: 11 Karma: 10 Join Date: Dec 2009 Device: none	regex search for roman numerals I'll preface this by saying that this is the first time I've used regex. using the expression //h:b[re:test(., '\bX{0,2}V?I{0,3}V?X?\b')] to search for roman numerals but it's still picking up words with an I in them like CHOICE or HOLIDAY. shouldn't the word boundry \b markers take care of that, or do they not "collapse" in when no X or V is found? there may be a better and more efficient way to do this, but like I said, this is one of the first regex lines I've written. Thanks

12-16-2009, 05:36 PM	#2
kovidgoyal creator of calibre Posts: 43,839 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Easier to use Code: '[XVIL]+' which makes use of the fact that there are no (or very few) words made up only of the letters X,V,I or L

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12-16-2009, 05:55 PM	#3
Blurr Member Posts: 11 Karma: 10 Join Date: Dec 2009 Device: none	Heh, wow, just a tad more efficient. Still needs the \b markers though or it picks up words with an I in them. Thanks.

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