Okay, I've programmed ColdFusion for a few years now. I'm always replacing line breaks by doing:
-----
<cfset MyString = Replace(MyString, "
", "", "ALL")>
-----
Now I know you can do the same using either #chr(10)# and/or #chr(13)#. However, I never know which one to use or why? Can someone help explain this so that I will remember it in the future? Which of the following do I want to use and why?:
<cfset MyString = Replace(MyString, "#chr(10)#", "", "ALL")>
<cfset MyString = Replace(MyString, "#chr(13)#", "", "ALL")>
<cfset MyString = Replace(MyString, "#chr(10)##chr(13)#", "", "ALL")>
<cfset MyString = Replace(MyString, "#chr(13)##chr(10)#", "", "ALL")>
or:
<cfset MyString = Replace(MyString, "#chr(10)#", "", "ALL")>
AND THEN
<cfset MyString = Replace(MyString, "#chr(13)#", "", "ALL")>
Andrew
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pinal has given you the correct answer, here's just a little more detail
why use this?
<cfset MyString = Replace(MyString, "#chr(10)##chr(13)#", "", "ALL")>
on a windows-based system when you hit enter two values are sent to the system, ascii characters 10 and 13, as a new line with a carriage return, but on a unix based system only the acii character 10 is sent to the os which is interpreted as a newline with a carriage return
no points just adding some info
The above really sum it up. You are safest using the combo, but as indicated it is operating system dependant.
Macs now follow Unix if they are OS X or newer. Some flavors of linux actually use both like windows.
In general in any language you should use the combo of both to ensure cases are caught as the first test. But test test and test again. You can't always use both. Just 99% of the time. So start with both and if that doesn't work then try just the one.
Maybe I'm confused, but based on your answers I would think the appropriate way would be to do either one of the following:
<--- Fix Windows Line Breaks --->
<cfset MyString = Replace(MyString, "#chr(10)##chr(13)#", "", "ALL")>
<--- Then Fix Unix Line Breaks --->
<cfset MyString = Replace(MyString, "#chr(13)#", "", "ALL")>
or
<--- Use a Regular Expression to Fix Both At Once --->
<cfset MyString = ReReplace(MyString, "(#chr(10)#?#chr(13)#?)", "", "ALL")>
I'm not positive on the regular expression above, but know it can be made to work. Anyway, based on the explanations given, using Pinal's code of:
<cfset MyString = Replace(MyString, "#chr(10)##chr(13)#", "", "ALL")>
Would only fix Windows line breaks, but not Unix line breaks, right!?
Unfortunatly you are asking for an answer to which there is no correct solution.
WHich one is better? Depends on the operating system of the server, and where the data is coming from.
I always start out an application with both. (Although like this which is more efficient:
<cfset MyString = Replace(MyString, chr(10) & chr(13), "", "ALL")>)
Then see if it works, if not adjust.
In general, you will not have to change because an application will receive data from the same type of source and is usually on only one type of web server.
By definition, characters inside [ and ] are "or" ... if you use round parenthesis ( and ) then you need the | ...
as for the "+" you are relying on scope="ALL" to remove the LF and the CF, however, scope="ONE" will break windows ...
[chr(10)chr(13)] and (chr(10)|chr(13))
both mean: match the first occurance of either LF or CR ...
result: 1 blank line on UNIX only (on Windows, it would leave the CR behind)
(chr(10)(chr(13))?)
means: match the first occurance of LF or LFCR
result: 1 blank line (OS independant)
[chr(10)chr(13)]+
means: match all consecutive occurances of either LF or CR
result: multiple consecutive blank lines (OS independant)
(chr(10)(chr(13))?){x}
means: match x sequential occurances of LF or LFCR
result: remove x consecutive blank lines (OS independant)
so while it's not necessary to use "+" if you want to use scope="ALL" ... but as I said, the "+" will allow the use of the scope="ONE" ...
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by: pinaldavePosted on 2005-11-14 at 23:27:16ID: 15293722
I always use
<cfset MyString = Replace(MyString, "#chr(10)##chr(13)#", "", "ALL")>
chr10 stand for new line and chr13 stands for carriage return. We can replace that with empty string.
Regards,
---Pinal