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From |
KOTa <kota.alba@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: regexm |

Date |
Sat, 27 Aug 2011 15:52:47 +0200 |

yes, i do work now with split, just thought with regex it will be better. anyway, is there a way to find out how many expressions regexm finds? 1. what i mean is i can access the 1st 2nd etc up to 9 with regexs, but if i dont know how many there are -> i dont know which one is last. 2. what if more the 9 expressions found? according to manual regexs only can have 0-9 parameters. thanks 2011/8/27 Nick Cox <njcoxstata@gmail.com>: > Well, you did say "it always ends by "% th_aft". > > I will continue as I started. > > If you first blank out stuff you don't need then you can just use > -split- to separate out elements. If you parse on spaces then it is > immaterial when you have 2 or 3 digits before, you retrieve the number > either way. > > No need for regex demonstrated. > > Nick > > On Sat, Aug 27, 2011 at 2:16 PM, KOTa <kota.alba@gmail.com> wrote: >> thanks Eric, Nick I used your advices and almost finished. >> >> but encountered one small problems on the way. >> >> i have the same type of string - "0.15%-$1(B) 0.14%-$2(B) 0.12%-$2(B) >> 0.10% th_aft." - number of digits after the dot can be 2 or 3, it's >> not constant >> >> and i am trying to extract the last % (i.e.0.10% in this case) using >> "$" like this: >> >> g example = regexs(0) if regexm( fee_str, "[0-9]+\.[0-9]*[%]$") or g >> example = regexs(0) if regexm( fee_str, "[0-9]+\.[0-9]*[%]+$") and it >> fails in both cases. >> >> the result is empty >> >> it does extract the first one (0.15%) if i dont use "$" >> >> what is wrong? >> >> thanks >> >> p.s. Nick, th_aft is not a terminator, its not always there >> >> >> 2011/8/27 Nick Cox <njcoxstata@gmail.com>: >>> It is not obvious to me that you need -regexm()- at all. >>> >>> The text " th_aft" appears to be just a terminator that you don't care >>> about, so remove it. >>> >>> replace j = subinstr(j, " th_aft", "", .) >>> >>> The last element can be separated off and then removed. >>> >>> gen last = word(j, -1) >>> >>> replace j = reverse(j) >>> replace j = subinstr(j, word(j,1) , "", 1) >>> replace j = reverse(j) >>> >>> We reverse it in order to avoid removing any identical substring. >>> >>> Those three lines could be telescoped into one. >>> >>> Then it looks like an exercise in -subinstr()- and -split-. >>> >>> Nick >>> >>> On Sat, Aug 27, 2011 at 2:28 AM, Eric Booth <ebooth@ppri.tamu.edu> wrote: >>>> <> >>>> >>>> Here's an example...note that I messed with the formatting of the %'s and $'s in my example data a bit to show how flexible the -regex- is in the latter part of the code; however, you'll need to check that there aren't other patterns/symbols in your string that could break my code. >>>> There are other ways to approach this, but I think the logic here is easy to follow: >>>> >>>> *************! watch for wrapping: >>>> >>>> **example data: >>>> clear >>>> inp str70(j) >>>> "A: 0.35%-$197(M) 0.30%-$397(M) 0.27% th_aft." >>>> "A: 0.25%-$198(M) 0.12%-$398(M) 0.99%-$300(M) 0.00% th_aft." >>>> "A: 1.0%-$109(M) 0.1% th_aft." >>>> "A: 0%-$199(M) 0.30%-$366(M) 1.99% th_aft." >>>> end >>>> >>>> >>>> >>>> **regexm example == easier to use -split- initially >>>> g example = regexs(0) /// >>>> if regexm(j, "(([0-9]+\.[0-9]*[%-]+)([\$][0-9]*))") >>>> l >>>> drop example >>>> >>>> >>>> **split: >>>> replace j = subinstr(j, "A: ", "", 1) >>>> split j, p("(M) ") >>>> >>>> **first, find x10 : >>>> g x10 = "" >>>> >>>> tempvar flag >>>> g `flag' = "" >>>> foreach var of varlist j? { >>>> replace `flag' = "`var'" if /// >>>> strpos(`var', "th_aft")>0 >>>> replace x10 = subinstr(`var', "th_aft.", "", .) /// >>>> if `flag' == "`var'" >>>> replace `var' = "" if strpos(`var', "th_aft")>0 >>>> } >>>> >>>> >>>> **now, create x1-x9 and y1-y9 >>>> forval num = 1/9 { >>>> g x`num' = "" >>>> g y`num' = "" >>>> cap replace x`num' = regexs(0) if /// >>>> regexm(j`num', "([0-9]+\.?[0-9]*[%]+)") /// >>>> & !mi(j`num') & mi(x`num') //probably overkill >>>> cap replace y`num' = regexs(0) if /// >>>> regexm(j`num', "([\$][0-9]*\.?[0-9]*)") /// >>>> & !mi(j`num') & mi(y`num') >>>> } >>>> **finally, create y10 == y2: >>>> g y10 = y2 >>>> >>>> >>>> ****list: >>>> l *1 >>>> l *2 >>>> l *3 >>>> >>>> *************! >>>> - Eric >>>> >>>> On Aug 26, 2011, at 6:59 PM, KOTa wrote: >>> >>>>> I am trying to extract some data from text variable and being new to >>>>> stata programming struggling with finding right format. >>>>> >>>>> my problem is as following: >>>>> >>>>> for example i have string variable as following: "A: 0.35%-$100(M) >>>>> 0.30%-$300(M) 0.27% th_aft." >>>>> >>>>> number of pairs "% - (M)" can be from 1 to 9 and it always ends by "% th_aft" >>>>> >>>>> I have 10 pairs of variables X1 Y1 .... X10 Y10 >>>>> >>>>> my goal is to extract all pairs from the string variable and split >>>>> them into my separate variables. >>>>> >>>>> in this case the result should be: >>>>> >>>>> X1 = 0.35% >>>>> Y1 = $100 >>>>> >>>>> X2 = 0.30% >>>>> Y2 = $300 >>>>> >>>>> X3-X9 = y3-Y9 = 0 >>>>> >>>>> X10 = 0.27% >>>>> Y10 = Y2 (i.e. last Y extracted from sting) >>>>> >>>>> I am trying to use regexm but unsuccessfully, Any suggestions? >>>>> >>> >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/statalist/faq >>> * http://www.ats.ucla.edu/stat/stata/ >>> >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/statalist/faq >> * http://www.ats.ucla.edu/stat/stata/ >> > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: regexm***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: regexm***From:*KOTa <kota.alba@gmail.com>

**Re: st: regexm***From:*Eric Booth <ebooth@ppri.tamu.edu>

**Re: st: regexm***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: regexm***From:*KOTa <kota.alba@gmail.com>

**Re: st: regexm***From:*Nick Cox <njcoxstata@gmail.com>

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