Thread Subject: regexprep wildcard problem

Hello,

Regexp and regexprep are great functions but for someone
who has not a very large history in programming the way
wildcards are dealt with in the code is a bit hard to
understand and the help file is not as complete as I had
hoped. However I need something replaced in my code and
maybe someone could help me.

I have the string 'atp[c]' which needs to be transformed
into 'atp', the same counts for 'atp[p]'.

I tried
regexprep({'atp[c]','atp[p]'}, '[]', '')
and
regexprep({'atp[c]','atp[p]'}, '[(\w+).*?]', '')
and many more but mostly the results are '[]' or atp[ or
atp[] but never 'atp'. I am at a loss, and I know it is
possible.

thanks

"Christian Kuijlaars":
<SNIP getting impatient...

don't repeat your post
us

"Christian Kuijlaars" <c.a.j.kuijlaars@student.tudelft.nl>
wrote in message <fn6us9$5fa$1@fred.mathworks.com>...
> Hello,
>
> Regexp and regexprep are great functions but for someone
> who has not a very large history in programming the way
> wildcards are dealt with in the code is a bit hard to
> understand and the help file is not as complete as I had
> hoped. However I need something replaced in my code and
> maybe someone could help me.
>
> I have the string 'atp[c]' which needs to be transformed
> into 'atp', the same counts for 'atp[p]'.
>
> I tried
> regexprep({'atp[c]','atp[p]'}, '[]', '')
> and
> regexprep({'atp[c]','atp[p]'}, '[(\w+).*?]', '')
> and many more but mostly the results are '[]' or atp[ or
> atp[] but never 'atp'. I am at a loss, and I know it is
> possible.
>
> thanks
>

Christian,
it's not just wildcards.
You should familiarise yourself with the syntax of a
regular expression, because those 2 regexprep calls do not
make much sense, I'm afraid. (hint: ... square brackets
have a special meaning ...)
If Matlab's documentation is not clear, just search
for "regular expression" in google, you should find plenty
of stuff.
HTH
Riccardo

 

> Christian,
> it's not just wildcards.
> You should familiarise yourself with the syntax of a
> regular expression, because those 2 regexprep calls do
not
> make much sense, I'm afraid. (hint: ... square brackets
> have a special meaning ...)
> If Matlab's documentation is not clear, just search
> for "regular expression" in google, you should find
plenty
> of stuff.
> HTH
> Riccardo

I expected the brackets to have a special meaning...as i
kept trying and trying and the program just ignored the
brackets so to say. I know i should familiarise myself but
time is slowly diminishing for the project I'm working on.
Thanks anyway because I think I will need this after this
project probably again.

"Christian Kuijlaars" <c.a.j.kuijlaars@student.tudelft.nl>
wrote in message <fn6us9$5fa$1@fred.mathworks.com>...
> Hello,
>
> Regexp and regexprep are great functions but for someone
> who has not a very large history in programming the way
> wildcards are dealt with in the code is a bit hard to
> understand and the help file is not as complete as I had
> hoped. However I need something replaced in my code and
> maybe someone could help me.
>
> I have the string 'atp[c]' which needs to be transformed
> into 'atp', the same counts for 'atp[p]'.
>
> I tried
> regexprep({'atp[c]','atp[p]'}, '[]', '')
> and
> regexprep({'atp[c]','atp[p]'}, '[(\w+).*?]', '')
> and many more but mostly the results are '[]' or atp[ or
> atp[] but never 'atp'. I am at a loss, and I know it is
> possible.
>
> thanks
>

>> regexprep({'atp[c]','atp[p]'}, '\[.\]', '')
ans =
    'atp' 'atp'
>>

This will work for any one character inbetween square
brackets. / per

"Christian Kuijlaars" <c.a.j.kuijlaars@student.tudelft.nl>
wrote in message <fn6us9$5fa$1@fred.mathworks.com>...
> Hello,
>
> Regexp and regexprep are great functions but for someone
> who has not a very large history in programming the way
> wildcards are dealt with in the code is a bit hard to
> understand and the help file is not as complete as I had
> hoped. However I need something replaced in my code and
> maybe someone could help me.
>
> I have the string 'atp[c]' which needs to be transformed
> into 'atp', the same counts for 'atp[p]'.
>
> I tried
> regexprep({'atp[c]','atp[p]'}, '[]', '')
> and
> regexprep({'atp[c]','atp[p]'}, '[(\w+).*?]', '')
> and many more but mostly the results are '[]' or atp[ or
> atp[] but never 'atp'. I am at a loss, and I know it is
> possible.
>
> thanks
>

>> regexprep({'atp[c]','atp[p]'}, '\[[cp]\]', '')
ans =
    'atp' 'atp'

and to be a bit more specific /per

In article <fn8fau$2u3$1@fred.mathworks.com>,
per isakson <poi.nospam@bimDOTkthDOT.se> wrote:
>"Christian Kuijlaars" <c.a.j.kuijlaars@student.tudelft.nl>
>wrote in message <fn6us9$5fa$1@fred.mathworks.com>...
>> I have the string 'atp[c]' which needs to be transformed
>> into 'atp', the same counts for 'atp[p]'.

>>> regexprep({'atp[c]','atp[p]'}, '\[.\]', '')
>ans =
> 'atp' 'atp'

>This will work for any one character inbetween square
>brackets. / per

Unfortunately it will also transform 'a[c]t[p]' to 'at' --
the pattern isn't anchored to only match terminal \[.\]
It will also do strange things to a[[]]tp

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