regex with ada?

regex with ada?

[Will May]

This (should) be a simple question. Is it possible to do regex commands
(e.g. s/hello/g) in ada?

What i want to do is to replace one word with another multiple times and i
know that it could be easily done with one regex expression.

Any help anyone?

Re: regex with ada?

[Mark Biggar]

"Will May" <will.may@btinternet.com> wrote in message news:<a0fq61$ks1$1@paris.btinternet.com>...
> This (should) be a simple question. Is it possible to do regex commands
> (e.g. s/hello/g) in ada?
> 
> What i want to do is to replace one word with another multiple times and i
> know that it could be easily done with one regex expression.

Well if you don't need wildcard support then every thing you need
for that task can be found in one of the standard packages ada.strings.fixed,
ada.strings.bounded or ada.strings.unbounded.  A combination of the routines
index and replace_slice in aloop will do what you want.

If you need wildcards then look at the two regex packages that come with Gnat,
a snobol clone and a unix regex like system.

--
Mark Biggar
mark.a.biggar@attbi.com

Re: regex with ada?

[Eric Merritt]

> 
> Well if you don't need wildcard support then every
> thing you need
> for that task can be found in one of the standard
> packages ada.strings.fixed,
> ada.strings.bounded or ada.strings.unbounded.  A
> combination of the routines
> index and replace_slice in aloop will do what you
> want.
> 
> If you need wildcards then look at the two regex
> packages that come with Gnat,
> a snobol clone and a unix regex like system.

I am afraid I feel the overwhelming compulsion to
point out the regular expresions are quite allot more
then simply wildcards. That being said, I am glad to
know thier is a gnat extension that supports them.
There my compulsion is sated :)

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Re: regex with ada?

[Robert Dewar]

Eric Merritt <cyberlync@yahoo.com> wrote in message news:<mailman.1009494362.8213.comp.lang.ada@ada.eu.org>...
> > 
 
> I am afraid I feel the overwhelming compulsion to
> point out the regular expresions are quite allot more
> then simply wildcards. That being said, I am glad to
> know thier is a gnat extension that supports them.


There are actually several packages that are relevant in
GNAT (GNAT.Regexp, GNAT.Regpat, and GNAT.Spitbol.Patterns). The first
two support regular expressions Unix-style in two different flavors,
the third supports the much more powerful notion of pattern matching
and replacement found in SNOBOL-4.

Note that these are not extensions, they are simply Ada
packages supplied with GNAT. It is conceivable that they
might be adapted to work with other Ada compilers, though
likely you will have trouble with unsupported pragmas and
attributes (the GNAT packages feel quite free to use GNAT
pragmas and attributes, and in some cases, these uses are
quite fundamental, e.g. the use of Unrestricted_Access in
the GNAT.Spitbol.Patterns.

Robert Dewar