Re: str_match qustion

Ziqiang,

Can you provide a case where str_match doesn't behave as you expect?

str_match is case sensitive. This means that any one of the following statements will return a missing value:

   i = str_match("ABC","a")
   i = str_match("ABC","bc")
   i = str_match("ABC","abc")

This will return a missing value too, because the characters aren't in the right order:

   i = str_match("ABC","AC")

These statements will return non-missing values:

   i = str_match("ABC","A")
   i = str_match("ABC","AB")
   i = str_match("ABC","BC")

There's a str_match_ic function which is not case sensitive. This function was added in NCL V6.0.0.

--Mary

On Nov 12, 2011, at 11:29 PM, JiangZiqiang wrote:

> Hello,
>
> When I use "str_match" function, it should return matched string.
> However, a matched string has existed, sometimes a missing value has been return still.
> I don't understand this, and I felt puzzled.
>
> function str_match ( string_val [*] : string, expression [1] : string )
> return_val [*] : string
>
> Ziqiang
>
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Received on Mon Nov 14 08:44:35 2011