On 03/22/2016 12:44 AM, Omar André Gonzáles Díaz wrote:
Hi,I have a DF with a column with "html", like this:
<IMG SRC="
https://ad.doubleclick.net/ddm/trackimp/N344006.1960500FACEBOOKAD/B9589414.130145906;dc_trk_aid=303019819;dc_trk_cid=69763238;ord=[timestamp];dc_lat=;dc_rdid=;tag_for_child_directed_treatment=?";
BORDER="0" HEIGHT="1" WIDTH="1" ALT="Advertisement">
I need to get this:
https://ad.doubleclick.net/ddm/trackimp/N344006.1960500FACEBOOKAD/B9589414.130145906;dc_trk_aid=303019819;dc_trk_cid=69763238;ord=[timestamp];dc_lat=;dc_rdid=;tag_for_child_directed_treatment=
?
I've got this so far:
https://ad.doubleclick.net/ddm/trackimp/N344006.1960500FACEBOOKAD/B9589414.130145906;dc_trk_aid=303019819;dc_trk_cid=69763238;ord=[timestamp];dc_lat=;dc_rdid=;tag_for_child_directed_treatment=?\";
BORDER=\"0\" HEIGHT=\"1\" WIDTH=\"1\" ALT=\"Advertisement
With this is the code I've used:
carreras_normal$Impression.Tag..image. <-
gsub("<img.+?src=[\"'](.*?)[\"'].*?>","\\1",carreras_normal$Impression.Tag..image.,
ignore.case = T)
*But I still need to use get rid of this part:*
https://ad.doubleclick.net/ddm/trackimp/N344006.1960500FACEBOOKAD/B9589414.130145906;dc_trk_aid=303019819;dc_trk_cid=69763238;ord=[timestamp];dc_lat=;dc_rdid=;tag_for_child_directed_treatment=
?*\" BORDER=\"0\" HEIGHT=\"1\" WIDTH=\"1\" ALT=\"Advertisement*
Thank you for your help.
You're querying an xml string, so use xpath, e.g., via the XML library
> as.character(xmlParse(y)[["//IMG/@SRC"]])
[1]
"https://ad.doubleclick.net/ddm/trackimp/N344006.1960500FACEBOOKAD/B9589414.130145906;dc_trk_aid=303019819;dc_trk_cid=69763238;ord=[timestamp];dc_lat=;dc_rdid=;tag_for_child_directed_treatment=?";
`xmlParse()` translates the character string into an XML document. `[[`
subsets the document to extract a single element. "//IMG/@SRC" follows
the xpath specification (this section
https://www.w3.org/TR/xpath-31/#abbrev of the specification provides a
quick guide) to find, starting from the 'root' of the document, a node,
at any depth, labeled IMG containing an attribute labeled SRC.
A variation, if there were several IMG tags to be extracted, would be
xpathSApply(xmlParse(y), "//IMG/@SRC", as.character)
Omar Gonzáles.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
This email message may contain legally privileged and/or confidential
information. If you are not the intended recipient(s), or the employee or
agent responsible for the delivery of this message to the intended
recipient(s), you are hereby notified that any disclosure, copying,
distribution, or use of this email message is prohibited. If you have received
this message in error, please notify the sender immediately by e-mail and
delete this email message from your computer. Thank you.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
