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Re: Using STREGEX/STRMID [message #71280 is a reply to message #71277]

Wed, 09 June 2010 12:23

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Jun 9, 2:19 pm, fgg <fabioguimaraesgoncal...@gmail.com> wrote:
> Hello,
>
> I'd like to get the "label" (i.e. 1033) from this string:
>
> IDL> str = '; ROI name: EVF: Layer: pts_slant.shp (Label=1033)'
>
> ...and I was wondering if there is a more elegant/efficient way of
> doing this than:
>
> IDL> pos0 = stregex(str, '=')+1
> IDL> posn = stregex(str, ')')
> IDL> print, strmid(str, pos0, posn-pos0)

You want the substring option of STREGEX,

str = stregex(str, '\(Label=([0-9]*)\)', /extract, /sub)
print, str[1]
1033

The zeroth substring is the full match.
The first substring is the one enclosed in parentheses. It's a little
confusing because the () are used to enclose regex substrings and \(\)
are the literal parentheses expected to appear in the string.

Craig

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		Re: Using STREGEX/STRMID By: fgg on Wed, 09 June 2010 14:01
		Re: Using STREGEX/STRMID By: Craig Markwardt on Wed, 09 June 2010 12:23

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