On 09/29/2017 12:02 AM, Tóth Dénes wrote:
On 09/28/2017 10:25 PM, Dan Abner wrote:
Hi all,
I have a large number of text strings to search for enumerated items.
However, I am receiving this error message even though I thought that I
properly escaped the special character closed parenthesis:
Count<-str_count(text3,keywords)
Error in stri_count_regex(string, pattern, opts_regex = opts(pattern)) :
Syntax error in regexp pattern. (U_REGEX_RULE_SYNTAX)
===
Here is example code:
text1<-"This is a list:
1) Number 1
2) Etc
3) Etc"
text2<-"This is NOT a list:
Blah, blah, blah
Blah, blah, blah"
text3<-c(text1,text2)
text3
{keywords<-c(paste(0:9,"\\)"),paste(0:9,"\\)",sep=""),
paste(0:9,"."),paste(0:9,".",sep=""),"-","*")}
You should carefully read the docs, see ?regexp.
You really do not want to pass a multi-element vector as 'keywords' in
this case, but instead:
stri_count_regex(text3, "[0-9]+\\) ")
or:
stri_count_regex(text3, "[[:digit:]]+\\) ")
Ah, now I see what you were after: enumerations are not in a standard
format, so "1) " can be "1)", "1.", "1 .".
In this case:
text <- "1)Hello\n2.Hi\n3 .Cheers"
keywords <- "[0-9]+(\\)| *?\\.)"
stri_count_regex(text, keywords)
Note the '|' sign in the keyword definition. It means OR in this
context. So literally the regexp expression above can be translated as:
A digit or a digit string followed by a parenthesis, or by arbitrary
number of spaces (even 0) before a dot.
HTH,
Denes
BTW, I do not understand why to use the stringr package if it is just a
wrapper around the stringi package.
Regards,
Denes
keywords
Count<-str_count(text3,keywords)
===
I am looking for Count<-c(3,0)
Any suggestions?
Thanks!
Dan
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--
Dr. Tóth Dénes ügyvezető
Kogentum Kft.
Tel.: 06-30-2583723
Web: www.kogentum.hu
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
