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Re: st: regexm


From   KOTa <kota.alba@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: regexm
Date   Sat, 27 Aug 2011 15:16:09 +0200

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?
>>>
>
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