[R] String Matching

[PIKAL Petr]

Hi

Maybe I am completely wrong but do you really need regular expressions?

You say you want to compare first nine characters of id?

> substr(id, 1,9)==cusip
[1] TRUE
>

or the last six?

> substr(id, nchar(id)-6, nchar(id))=="432.rds"
[1] TRUE
>

Cheers
Petr


> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Glenn
> Schultz
> Sent: Friday, January 29, 2016 6:02 PM
> To: R Help R
> Subject: [R] String Matching
>
> All,
>
> I have a file named as so 313929BL4FNMA2432.rds  the user may pass
> either the first 9 character or the last six characters.  I need to
> match the remainder of the file name using either the first nine or
> last six.  I have read the help files for Regular Expression as used in
> R and I think what I want to use is glob2rx.
>
> I have worked a minimal example to test my code:
>
> id <- "313929BL4FNMA2432.rds"
> cusip <- "313929BL4"
> poolnumm <- "FNMA2432"
> paste(cusip, ".*", ".rds")
> glob2rx(paste(cusip, ".*", ".rds"), trim.head = TRUE, trim.tail = TRUE)
>
> This returns false which leads me to believe that it is not working
> glob2rx(paste(cusip, ".*", ".rds"), trim.head = TRUE, trim.tail = TRUE)
> == id
>
> I am going to use as follows in the function below - which returns the
> error file not found
>
> MBS_Test <- function(MBS.id = "character"){ MBS <-
> glob2rx(paste(MBS.id, ".*", "//.rds", sep = ""), trim.tail = TRUE)
> MBS.Conn <- gzfile(description = paste(system.file(package =
> "BondLab"), "/BondData/", MBS, sep = ""), open = "rb") MBS <-
> readRDS(MBS.Conn)
> on.exit(close.connection(MBS.Conn))
> return(MBS)
> }
>
> Any help to get me in the right direction is appreciated - Glenn
> ______________________________________________
> R-help at 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.

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