[ncl-talk] Problem with str_match

[Wei Huang]

Sophie,

In the earlier version, NCL used regex for string match, which is why it
worked there.
The current version, NCL has switched to character match, which is why it
failed there.

Here is a short code (based on your case) on how to use NCL str_match.

;NCL does not support regex string match/compare, the following code will
return missing.
 varname="rntcre"
 a=str_match(varname,"r[lsn][ats]cre")
 print (a)

;NCL supports plain character string match, the following code will return
the match.
 b=str_match(varname,"ntcre")
 print (b)
------------------------
Here is the print out from the code above.
-------------------------------
Variable: a
Type: string
Total Size: 8 bytes
            1 values
Number of Dimensions: 1
Dimensions and sizes:   [1]
Coordinates:
Number Of Attributes: 1
  _FillValue :  missing
(0)     missing


Variable: b
Type: string
Total Size: 8 bytes
            1 values
Number of Dimensions: 1
Dimensions and sizes:   [1]
Coordinates:
(0)     rntcre


Please let ncl-talk know if there is anything can help.

Wei


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On Mon, Mar 9, 2015 at 9:27 AM, TYTECA Sophie <sophie.tyteca at meteo.fr>
wrote:

> Hello,
>
> I have a problem with str_match function and the NCL last version .
> the result gives "missing" in my string
>
> Here my machine: Linux x86_64 GNU/Linux
>
> *ncl*
>  Copyright (C) 1995-2014 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language *Version 6.2.1*
>  The use of this software is governed by a License Agreement.
>  See http://www.ncl.ucar.edu/ for more details.
> *ncl 0> varname="rntcre"*
> *ncl 1> a=str_match(varname,"r[lsn][ats]cre")*
> *ncl 2> print (a)*
>
> Variable: a
> Type: string
> Total Size: 8 bytes
>             1 values
> Number of Dimensions: 1
> Dimensions and sizes:    [1]
> Coordinates:
> Number Of Attributes: 1
>   _FillValue :    missing
> (0)    missing
>
> this function works with NCL previous version:
>
> *ncl*
>  Copyright (C) 1995-2012 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language *Version 6.1.0*
>  The use of this software is governed by a License Agreement.
>  See http://www.ncl.ucar.edu/ for more details.
> *ncl 0> varname="rntcre"*
> *ncl 1> a=str_match(varname,"r[lsn][ats]cre")*
> *ncl 2> print (a)*
>
> Variable: a
> Type: string
> Total Size: 8 bytes
>             1 values
> Number of Dimensions: 1
> Dimensions and sizes:    [1]
> Coordinates:
> (0)    rntcre
>
> Could you help me, please?
> Thank you very much
>
> ----- Météo-France -----
> TYTECA SOPHIE
> CNRM/GMGEC/VDR
> sophie.tyteca at meteo.fr
> Fixe : +33 561079379
>
>
>
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