Perl - Regex to extract only the comma-separated strings -

-

i have question hoping with...

i have variable contains content webpage (scraped using www::mechanize).

the variable contains data such these: 

$var = "ewrfs sdfdsf cat_dog,horse,rabbit,chicken-pig" $var = "fdsf iiukui aawwe dffg elephant,mouse_rat,spider,lion-tiger hdsfds jdlkf sdf" $var = "dsadp poids pewqwe antelope-giraffe,frog,fish,crab,kangaroo-koala sdfdsf hkew"

the bits interested in above examples are:

@array = ("cat_dog","horse","rabbit","chicken-pig") @array = ("elephant","mouse_rat","spider","lion-tiger")  @array = ("antelope-giraffe","frog","fish","crab","kangaroo-koala")

the problem having:

i trying extract comma-separated strings variables , store these in array use later on.

but best way make sure strings @ start (ie cat_dog) , end (ie chicken-pig) of comma-separated list of animals not prefixed/suffixed comma.

also, variables contain webpage content, inevitable there may instances commas immediately succeeded space , word, correct method of using commas in paragraphs , sentences...

for example:

saturn long thought ringed planet, however, known not case.                                                       ^        ^                                                      |        |                                     note spaces here , here

i not interested in cases comma followed space (as shown above).

i interested in cases comma not have space after (ie cat_dog,horse,rabbit,chicken-pig)

i have tried number of ways of doing cannot work out best way go constructing regular expression.

how about

[^,\s]+(,[^,\s]+)+

which match 1 or more characters not space or comma [^,\s]+ followed comma , 1 or more characters not space or comma, 1 or more times.

further comments

to match more 1 sequence add g modifier global matching.
following splits each match $& on , , pushes results @matches. 

my $str = "sdfds cat_dog,horse,rabbit,chicken-pig more pig,duck,goose"; @matches;  while ($str =~ /[^,\s]+(,[^,\s]+)+/g) {     push(@matches, split(/,/, $&)); }     print join("\n",@matches),"\n";

Popular posts from this blog

How to calculate SNR of signals in MATLAB? -

-
i've encountered simple, yet fundamental problem on calculating snr: there several signals : s1 = original , pure clean signal without noise. n1 = white gaussian noise going added s1. s2 = s1 + n1 (the noisy signal before performing noise-reduction algorithm) s3 = noise-reduced signal (after performing noise reduction algorithm) n2 = s3 - s1 (the amount of noise after performing noise-reduction algorithm) now want compare snr before , after performing noise-reduction algorithm. which signals should consider snr_before!? s1/n1 or s2/n1 ? which signals should consider snr_after!? s3/n1 or s3/n2 ? which commands or functions should use in matlab in order compute snr_before , snr_after? thanks billion putting time on helping me. what know calculating snr before : snrbeforenoise = mean( signal .^ 2 ) / mean( noise .^ 2 ); and snr after : residual_noise = signal - noise_reduced_signal; snr_after = mean( signal .^ 2 ) / mean( residual_noise .^ 2...
Read more

c# - Attempting to upload to FTP: System.Net.WebException: System error -

-
i have api takes in xml , uploads files based on information in xml. uploads on schedule (also xml), , have tested surrounding , know works. i getting error 40% of time on first file attempt upload in each time cycle (time cycle = 45 minutes files, 30 minutes others). here code upload: try { loggerftp.log("uploading file: " + filename, false); // create request. ftpwebrequest request = (ftpwebrequest)webrequest.create(appsettingsftp.ftpurl + @"/" + filename); request.method = webrequestmethods.ftp.uploadfile; request.timeout = 6000000; //set 100 minutes //request.timeout = -1; //set infinite // add login credentials. request.credentials = new networkcredential(appsettingsftp.ftplogin, appsettingsftp.ftppassword); // grab file contents. streamreader sourcestream = new streamreader(appsettingsftp.uploadfiledirectory + filename); byte[] filecontents = encoding.utf8.getbytes(sourcestream.readtoend()); sourcest...
Read more

ios - UISlider customization: how to properly add shadow to custom knob image -

-
Image
i need place custom knob image shadow uislider. far have image of 38x38, of there region defines shadow of knob. now while using image, when slide knob extreme ends actual knob not able cover end points, hence end points visible under transparent region of knob image this code using customize uislider uiimage *slidebtimg = [uiimage imagenamed:sliderknobimg]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatenormal]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatehighlighted]; how can implement custom knob shadow beneath it, covering end points?? look inside uislider.h , there methods let customize slider knob , track needed. (ios 2.0 , above) // lets subclass lay out track , thumb needed - (cgrect)minimumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)maximumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)trackrectforbounds:(cgrect)bounds; - (cgrect)thumbrectforbounds:(cgrect)bounds trackrect:(cgrect)rect value:...
Read more