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Re: Testing validity of numerical content of a string [message #51742]

Wed, 06 December 2006 17:49

Brian Larsen
Messages: 270
Registered: June 2006

Senior Member

On Dec 6, 6:38 pm, David Fanning <n...@dfanning.com> wrote:
> Y.T. writes:
>> Maybe this is a stupid question, but is there a way in IDL to tell
>> whether a string contains a valid representation of a particular data
>> type? For example an integer? I can do something like
>

One "unixy" way to do this is with regular expressions. I end up using
these all the time (any should more).

Play with something like:
IDL> a='hello'
IDL> print, stregex(a, '[a-zA-Z]', /boolean)
1
IDL> b='3.14159'
IDL> print, stregex(b, '[a-zA-Z]', /boolean)
0
And one could work out a better regexp that looked for other
non-numeric chars as well.

This is good and easy.

Cheers,
Brian

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[Message index]

		Re: Testing validity of numerical content of a string By: Brian Larsen on Wed, 06 December 2006 17:49
		Re: Testing validity of numerical content of a string By: David Fanning on Wed, 06 December 2006 17:38
		Re: Testing validity of numerical content of a string By: Brian Larsen on Wed, 06 December 2006 18:50

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