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Re: Regular Expressions [message #24213 is a reply to message #24195]

Fri, 16 March 2001 09:20

John-David T. Smith is currently offline

John-David T. Smith
Messages: 384
Registered: January 2000

Senior Member

Wayne Landsman wrote:

> P.S. The real-life problem I am working on deals not with 'l' but with
> apostrophes. I am trying to speed up the processing of FITS header
> values, where is a string is delineated by non-repeating apostrophes, and a
> possessive is indicated by a double apostrophe.
>
> VALUE = 'This is Wayne''s FITS value' / Example string field

how about:

IDL> value= "VALUE = 'This is Wayne''s FITS value' / A FITS COMMENT"
IDL> print,(stregex(value,/SUBEXPR,/EXTRACT,"= *'(.*)'([^']|$)"))[1]

You will always have something before the initial "'" in the full header
record.

You can then change double quotes to single quotes in the usual way with
a strpos loop.

JD

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[Message index]

		regular expressions By: Michael Werger on Fri, 04 June 1999 00:00
		Re: Regular expressions By: Brian Jackel on Fri, 10 November 2000 00:00
		Re: Regular expressions By: Martin Schultz on Fri, 10 November 2000 00:00
		Re: Regular expressions By: Liam E. Gumley on Fri, 10 November 2000 00:00
		Re: Regular Expressions By: John-David T. Smith on Thu, 15 March 2001 16:09
		Re: Regular Expressions By: Wayne Landsman on Thu, 15 March 2001 19:24
		Re: Regular Expressions By: John-David T. Smith on Fri, 16 March 2001 09:20
		Re: Regular Expressions By: Pavel A. Romashkin on Mon, 19 March 2001 13:52
		Re: Regular Expressions By: Craig Markwardt on Tue, 20 March 2001 15:23
		Re: Regular Expressions By: John-David T. Smith on Tue, 20 March 2001 15:28
		Re: Regular Expressions By: Mark Hadfield on Tue, 20 March 2001 14:48
		Re: Regular Expressions By: Wayne Landsman on Tue, 20 March 2001 12:14
		Re: Regular Expressions By: Martin Schultz on Tue, 20 March 2001 04:39

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