Re: [R] extracting values from txt with regular expression

On Thu, Jun 7, 2012 at 1:40 PM, emorway wrote: > Thanks for your suggestions.  Bert, in your response you raised my awareness > to "regular expressions".  Are regular expressions the same across various > languages?  Consider the following line of text: > > txt_line<-" PERCENT DISCREPANCY =      

Re: [R] extracting values from txt with regular expression

Hello, Just put the entire regexp between parenthesis. extracted <- strsplit(gsub("([+-]?(?:\\d+(?:\\.\\d*)|\\.\\d+)(?:[eE][+-]?\\d+)?)","\\1%&",txt_line),"%&") extracted sapply(strsplit(unlist(extracted), "="), "[", 2) As for speed, I believe that this might take longer. It will have to

Re: [R] extracting values from txt with regular expression

Hi Dan and Rui, Thank you for the suggestions, both were very helpful. Rui's code was quite fast...there is one more thing I want to explore for my own edification, but first I need some help fixing the code below, which is a slight modification to Dan's suggestion. It'll no doubt be tough to be

Re: [R] extracting values from txt with regular expression

> -Original Message- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of emorway > Sent: Thursday, June 07, 2012 10:41 AM > To: r-help@r-project.org > Subject: [R] extracting values from txt with regular expression > > Tha

[R] extracting values from txt with regular expression

Thanks for your suggestions. Bert, in your response you raised my awareness to "regular expressions". Are regular expressions the same across various languages? Consider the following line of text: txt_line<-" PERCENT DISCREPANCY = 0.01 PERCENT DISCREPANCY = -0.05" It s