Re: st: Regular expressions

[Roberto Ferrer <refp16@gmail.com>]

Previous solutions to Estrella's Problem 1 won't work if there is a year between
parenthesis in the movie name. I think that is not common, but maybe
we can focus
on the assumption that the year of the movie is always at the end.

*------------------ begin code ------------------


clear all
set more off

set obs 1
gen movie = "Robin (1984) Hood (2000)"

* Fail
gen movie2 = rtrim(substr(movie, 1, index(movie, "(") - 1))
gen movie3 = trim(regexr(movie, "(\([1-2][0-9][0-9][0-9]\))", ""))

* Alternatives
gen movie4 = trim(substr(movie, 1, length(movie)-6))
gen movie5 = trim(reverse(substr(reverse(movie), 7, .)))
gen movie6 = trim(regexr(movie, "(\([1-2][0-9][0-9][0-9]\)$)", ""))

list

*----------------- end code ----------------------


On Fri, Mar 7, 2014 at 9:11 AM, Joe Canner <jcanner1@jhmi.edu> wrote:
> Good point about the first digit :)
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: Friday, March 07, 2014 8:38 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: Regular expressions
>
> Unsurprisingly, this is almost identical to Joe's
>
> I feel confident that the first digit must be 1 or 2.
> Nick
> njcoxstata@gmail.com
>
>
> On 7 March 2014 13:35, Nick Cox <njcoxstata@gmail.com> wrote:
>> clear
>> set obs 1
>> gen test = "Robin Hood (2000)"
>> gen test2 = trim(regexr(test, "(\([1-2][0-9][0-9][0-9]\))", ""))
>> list
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 7 March 2014 13:28, Marco Savegnago <savegnago.marco@gmail.com> wrote:
>>> Dear all,
>>> as regard point 1) this might work:
>>>
>>> gen movie2 = rtrim(substr(movie, 1, index(movie, "(") - 1))
>>>
>>> I thinks it works as long as the title of the movie does not contain
>>> other round brackets except those for the year.
>>>
>>> What do you think?
>>> best,
>>> Marco
>>>
>>> 2014-03-07 12:49 GMT+01:00 Nick Cox <njcoxstata@gmail.com>:
>>>> Your second problem sounds like for -split-. I wouldn't reach for
>>>> regular expressions there.
>>>> Nick
>>>> njcoxstata@gmail.com
>>>>
>>>>
>>>> On 7 March 2014 11:40, Estrella Gomez <estrellastata@gmail.com> wrote:
>>>>> Hi,
>>>>>
>>>>> I would like to do two modifications to two string variables using
>>>>> regular expression:
>>>>>
>>>>> 1) I have a list of movie titles with a year included; for instance:
>>>>> "Robin Hood (2010)". I would like to drop the years and the
>>>>> parenthesis, so the final value should be "Robin Hood". The number of
>>>>> words in the title varies a lot across movies
>>>>>
>>>>> 2) I have a variable indicating where the movie was produced. In some
>>>>> cases there are several countries, for instance "UK, Germany, Canada,
>>>>> Switzerland". I would like to generate one variable per country (1st
>>>>> variable take value UK, 2nd Germany and so on). Again, the number of
>>>>> countries per movie is not fixed; it varies from 1 to 4
>>>>>
>>>>> Any suggestion?
>>>>>
>>>>> Thanks a lot,
>>>>> Estrella
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