dynamic replacement of words in an external txt

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January 12th, 2004, 05:55 AM

coops241180

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Join Date: Jan 2004

Location: UK

Posts: 16

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dynamic replacement of words in an external txt

Hi all, this forum has been great use to me in picking up help and code for my various work projects..

currently i'm working on some code that allows me to populate the links in a flat html file with an extra url variable e.g
http://www.blahblah.com?oldvariable=8&newvar=12 becomes

http://www.blahblah.com?oldvariable=8&newvar=20

there are usualyl about 30 of these links in a text file each of which require a different value for the chosen url variable.

i was doing quite well - i can read the file in and remove all the old values so that i'm just left with

http://www.blahblah.com?oldvariable=8&newvar=

but to replace all these with different numbers i used the following code.. which as i'm sure you'll rapidly realise does something rather distasteful:

PHP Code:


		
			
 counter=0

        thisline=thisfile.readall

        pos = instr(thisline,"link_id")

        while pos > 0

            response.write thisline

            oldlinkid = mid(thisline,pos,8)            

            newlinkid = oldlinkid & currlinkid

            currlinkid = currlinkid+1

            response.write thisline & "<br>" & newlinkid & "<br>" & oldlinkid & "<br>" & currlinkid & "<br>" & pos

            thisline = replace(thisline,oldlinkid,newlinkid,pos,1,0)

            pos = instr(pos+len("link_id"),thisline,"link_id")

        wend

        response.write thisline                    'write the new line to the broswer

        filetemp.WriteLine(thisline)            'write the new line to the new file

yes - as i discovered today the replace function only returns the string from the start parameter of the function.

can anybody point me in the right direction - all i need is to keep the rest of the string before the point where the replace is made.. then it should work fine...

Thanks for any help

January 12th, 2004, 08:50 AM

imbrokn

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Join Date: Sep 2001

Location: NJ

Posts: 428

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Look into Regular Expresions. http://www.4guysfromrolla.com/webte...pressions.shtml
That should get you started

January 12th, 2004, 09:21 AM

coops241180

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Join Date: Jan 2004

Location: UK

Posts: 16

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yeah - i'd tried regular expressions previosly - came into difficulty when there was more than once occurence on each line.. but not to worry - i came up with a solution to the above problem...

PHP Code:


		
			
 thisline=thisfile.readall

        pos = instr(thisline,"link_id")

        while pos > 0

            oldlinkid = mid(thisline,pos,8)

            newlinkid = oldlinkid & currlinkid

            currlinkid = currlinkid+1

            response.write newlinkid & "<br>" & oldlinkid & "<br>" & currlinkid & "<br>" & pos & "<br>"

            thisline = left(thisline,pos-1) & replace(thisline,oldlinkid,newlinkid,pos,1,0)

            pos = instr(pos+len("link_id"),thisline,"link_id")

        wend

        response.write thisline                    'write the new line to the broswer

        filetemp.WriteLine(thisline)            'write the new line to the new file

cheers for the suggestion tho...
hope anyone who comes up against a similar problem find this helpful..

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