oooups. Thank you very much.
2009/1/9 Duncan Murdoch <murd...@stats.uwo.ca>
> On 1/9/2009 10:38 AM, David Hajage wrote:
>
>> Dear R useRs,
>>
>> Sorry for this foolish question, but I can't find how to escape the *
>> character when using grep :
>>
>
> You use a backslash to escape the *. Unfortunately, to enter a backslash
> in an R string, you need to escape it. So the pattern is "\\*".
>
> Duncan Murdoch
>
>
>> grep("-", c("/3", "2*3", "4-4"))
>>>
>> [1] 3
>>
>>> grep("/", c("/3", "2*3", "4-4"))
>>>
>> [1] 1
>>
>>> grep("*", c("/3", "2*3", "4-4"))
>>>
>> Erreur dans grep("*", c("/3", "2*3", "4-4")) :
>> expression régulière incorrecte '*'
>> De plus : Warning message:
>> In grep("*", c("/3", "2*3", "4-4")) :
>> erreur rgcomp : 'Expression régulière précédente incorrecte'
>>
>>> grep("\*", c("/3", "2*3", "4-4"))
>>>
>> Erreur dans grep("*", c("/3", "2*3", "4-4")) :
>> expression régulière incorrecte '*'
>> De plus : Warning messages:
>> 1: '\*' est un code escape non reconnu dans une chaîne de caractères
>> 2: code escape non reconnu éliminé de "\*"
>> 3: In grep("*", c("/3", "2*3", "4-4")) :
>> erreur rgcomp : 'Expression régulière précédente incorrecte'
>>
>> Best regards,
>>
>> david
>>
>> [[alternative HTML version deleted]]
>>
>>
>>
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>>
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>
>
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