Regular Expression Problem...

[andrea.gavana@agip.it]

Hello NG,

I am quite new with Python... I'm writing an application that does
also some regexp things on strings, but I'm having problem about
identifying/extracting a substring from another string. What I have to do
is to extract all the strings that begins with a "$" character, but
excluding characters like "." (point) and "'" (single quote) and "\" "/"
(slashes). For example I have:

1) This Is An $EXAMPLE String
2) This Is An $EXAMPLE.String
3) 'This Is An $EXAMPLE'
4) This Is An \$EXAMPLE\Strin g;

I would like to extract only the "keyword" $EXAMPLE and what I'm using at
the moment is:

#CODE BEGIN
import re

mystring = "This Is An \$EXAMPLE\Strin g;"
regex = re.compile("[\$]+\S*",re.IGNORE CASE)
keys = regex.findall(m ystring)

#CODE END

Obviously this code returns things like $EXAMPLE', $EXAMPLE/, $EXAMPLE. and
so on...
Does anyone have a suggestion?

Thank you a lot.

Andrea.

------------------------------------------------------------------------------------------------------------------------------------------

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[Jorge Godoy]

Re: Regular Expression Problem...

andrea.gavana@a gip.it writes:
[color=blue]
> #CODE BEGIN
> import re
>
> mystring = "This Is An \$EXAMPLE\Strin g;"
> regex = re.compile("[\$]+\S*",re.IGNORE CASE)
> keys = regex.findall(m ystring)
>
> #CODE END[/color]

regex = re.compile("[\$]+\w*",re.IGNORE CASE)
[color=blue][color=green][color=darkred]
>>> import re
>>>
>>> mystring = "This Is An \$EXAMPLE\Strin g;"
>>> regex = re.compile("[\$]+\w*",re.IGNORE CASE)
>>> keys = regex.findall(m ystring)
>>> keys[/color][/color][/color]
['$EXAMPLE'][color=blue][color=green][color=darkred]
>>>[/color][/color][/color]


Be seeing you,
--
Godoy. <godoy@ieee.org >

[Peter Otten]

Re: Regular Expression Problem...

andrea.gavana@a gip.it wrote:
[color=blue]
> identifying/extracting a substring from another string. What I have to do
> is to extract all the strings that begins with a "$" character, but
> excluding characters like "." (point) and "'" (single quote) and "\" "/"
> (slashes). For example I have:
>
> 1) This Is An $EXAMPLE String
> 2) This Is An $EXAMPLE.String
> 3) 'This Is An $EXAMPLE'
> 4) This Is An \$EXAMPLE\Strin g;
>
> I would like to extract only the "keyword" $EXAMPLE and what I'm using at[/color]

Is that what you want?
[color=blue][color=green][color=darkred]
>>> import re
>>> r = re.compile("[$]\w+")
>>> r.findall("""[/color][/color][/color]
.... 1) This Is An $EXAMPLE String
.... 2) This Is An $EXAMPLE.String
.... 3) 'This Is An $EXAMPLE'
.... 4) This Is An \$EXAMPLE\Strin g;
.... """)
['$EXAMPLE', '$EXAMPLE', '$EXAMPLE', '$EXAMPLE']

Peter

[Caleb Hattingh]

Re: Regular Expression Problem...

Obviously, Peter and Jorge are hardcore, but below is what a beginner like
me hacked up:

My point, I guess, is that it is possible to quickly get a solution to a
specific problem like this without being a total expert. The code below
was typed out once, and with only one minor correction before it produced
the required behaviour. Sure, it is not the general solution, but *this
is WHY I use python* - You get a lot of mileage out of the basics. Plus,
I can still read and understand the sub-optimal code, and probably will be
able to several years from now :)

Regular expressions are real powerful, and I am learning through using ViM
- but it takes time and practice.

(err, I didn't include your example with quotes, but you should get the
general idea)
***
'>>> stngs = [r'This Is An $EXAMPLE String', r'This Is An
$EXAMPLE.String ', r'This Is An $EXAMPLE',r'Thi s Is An \$EXAMPLE\Strin g']
'>>> stngs
['This Is An $EXAMPLE String', 'This Is An $EXAMPLE.String ', 'This Is An
$EXAMPLE', 'This Is An \\$EXAMPLE\\Str ing']

'>>> for i in stngs:
wdlist = i.split(' ')
for j in wdlist:
if j.find(r'$') > -1:
dwd = j.split('.')[0]
if dwd.find('\\') > -1:
dwd = dwd.split('\\')[1]
print dwd

$EXAMPLE
$EXAMPLE
$EXAMPLE
$EXAMPLE
'>>>
***




On Wed, 01 Dec 2004 13:40:17 +0100, Peter Otten <__peter__@web. de> wrote:
[color=blue]
> andrea.gavana@a gip.it wrote:
>[color=green]
>> identifying/extracting a substring from another string. What I have to
>> do
>> is to extract all the strings that begins with a "$" character, but
>> excluding characters like "." (point) and "'" (single quote) and "\" "/"
>> (slashes). For example I have:
>>
>> 1) This Is An $EXAMPLE String
>> 2) This Is An $EXAMPLE.String
>> 3) 'This Is An $EXAMPLE'
>> 4) This Is An \$EXAMPLE\Strin g;
>>
>> I would like to extract only the "keyword" $EXAMPLE and what I'm using
>> at[/color]
>
> Is that what you want?
>[color=green][color=darkred]
>>>> import re
>>>> r = re.compile("[$]\w+")
>>>> r.findall("""[/color][/color]
> ... 1) This Is An $EXAMPLE String
> ... 2) This Is An $EXAMPLE.String
> ... 3) 'This Is An $EXAMPLE'
> ... 4) This Is An \$EXAMPLE\Strin g;
> ... """)
> ['$EXAMPLE', '$EXAMPLE', '$EXAMPLE', '$EXAMPLE']
>
> Peter
>[/color]