Hello,
I need help in replacing one string pattern with another.
Ex: I have a financial security expression like
log(T 3.25 6/24/2004)/sqrt(T 4.5 6/19/2002)
Here "T 3.25 6/24/2004" is a variable on which I need to perform log
and then divide the result with 3.980. While parsing such expressions,
I need to find all occurence of date values and replace "/" character
with "~" character. I need to do this only for date portion of the
expression and not for divison operator.
After the transformation , this expression should be
log(T 3.25 6~24~2004)/sqrt(T 4.5 6~19~2002)
I was looking at replace method of regex object. But this doesn't
provide replacing one pattern with another pattern. I mean I'm not
able to figure out a way to find a date and replace all "/" characters
of the date with "~".
Regards,
Mahesha 5 11341
string temps = log(T 3.25 6/24/2004)/sqrt(T 4.5 6/19/2002)
temps = temps.Replace(@ "/", @"~");
temps = temps.Replace(@ "~sqrt", @"/sqrt");
Mahesha wrote: Hello,
I need help in replacing one string pattern with another. Ex: I have a financial security expression like log(T 3.25 6/24/2004)/sqrt(T 4.5 6/19/2002)
Here "T 3.25 6/24/2004" is a variable on which I need to perform log and then divide the result with 3.980. While parsing such expressions, I need to find all occurence of date values and replace "/" character with "~" character. I need to do this only for date portion of the expression and not for divison operator.
After the transformation , this expression should be log(T 3.25 6~24~2004)/sqrt(T 4.5 6~19~2002)
I was looking at replace method of regex object. But this doesn't provide replacing one pattern with another pattern. I mean I'm not able to figure out a way to find a date and replace all "/" characters of the date with "~".
Regards, Mahesha
Hello,
In this example log and sqrt were just some examples. In practice the
expression can be any expression involving mathematical operators and
functions...
I'm looking at a more generic solution...
Thanks,
Mahesha
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Hi Mahesha,
You can use "Replace" method available under "Regex" Class
to replace a matched string with replacement string.
In your code first extract the "Date" part and then
replace it with formatted date string.
The following code snippet might help you:
[SNIP]
string s = @"log(T 3.25 6/24/2004)/sqrt(T 4.5 6/19/2002)";
Regex r = new Regex(@"([\d]{1,2})/([\d]{1,2})/([\d]{4})");
s = r.Replace(s,"$1 ~$2~$3");
[/SNIP]
--
Cheers,
Rahul -----Original Message----- Hello,
I need help in replacing one string pattern with another. Ex: I have a financial security expression like log(T 3.25 6/24/2004)/sqrt(T 4.5 6/19/2002)
Here "T 3.25 6/24/2004" is a variable on which I need to
perform logand then divide the result with 3.980. While parsing such
expressions,I need to find all occurence of date values and
replace "/" characterwith "~" character. I need to do this only for date
portion of theexpression and not for divison operator.
After the transformation , this expression should be log(T 3.25 6~24~2004)/sqrt(T 4.5 6~19~2002)
I was looking at replace method of regex object. But this
doesn'tprovide replacing one pattern with another pattern. I
mean I'm notable to figure out a way to find a date and replace
all "/" charactersof the date with "~".
Regards, Mahesha .
You can also use MatchEvaluator (.NET Delegates) to
replace the matched string.
[SNIP]
string MatchHandler( Match m)
{
return m.Groups[0].Value.Replace( "/","~");
}
MatchEvaluator me = new MatchEvaluator( MatchHandler);
string s = @"log(T 3.25 6/24/2004)/sqrt(T 4.5 6/19/2002)";
Regex r = new Regex(@"[\d]{1,2}/[\d]{1,2}/[\d]{4}");
s = r.Replace(s,me) ;
[/SNIP]
I guess the first solution is more efficient, whereas this
solution is more elegant.
--
Cheers,
Rahul -----Original Message----- Hi Mahesha,
You can use "Replace" method available under "Regex"
Classto replace a matched string with replacement string.
In your code first extract the "Date" part and then replace it with formatted date string.
The following code snippet might help you:
[SNIP]
string s = @"log(T 3.25 6/24/2004)/sqrt(T 4.5 6/19/2002)"; Regex r = new Regex(@"([\d]{1,2})/([\d]{1,2})/([\d]{4})"); s = r.Replace(s,"$1 ~$2~$3");
[/SNIP]
-- Cheers, Rahul
-----Original Message----- Hello,
I need help in replacing one string pattern with another. Ex: I have a financial security expression like log(T 3.25 6/24/2004)/sqrt(T 4.5 6/19/2002)
Here "T 3.25 6/24/2004" is a variable on which I need toperform logand then divide the result with 3.980. While parsing
suchexpressions,I need to find all occurence of date values andreplace "/" characterwith "~" character. I need to do this only for date portion of theexpression and not for divison operator.
After the transformation , this expression should be log(T 3.25 6~24~2004)/sqrt(T 4.5 6~19~2002)
I was looking at replace method of regex object. But
thisdoesn'tprovide replacing one pattern with another pattern. I mean I'm notable to figure out a way to find a date and replace all "/" charactersof the date with "~".
Regards, Mahesha . .
Hi Rahul,
That was it..
Thanks a lot...
Regards,
Mahesha
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