RegEx - Is this doable? In .NET

  • Thread starter Thread starter VC
  • Start date Start date
V

VC

Hi All,
Here is what I am trying to do.
I have a list of strings (Array, Collection or some store) stringlist1
I have an input text file. datafile1.txt
Given the list of strings and this input file, I want to parse the file and
see if the strings are found in the file. The result from this operation is
a list that contains only those strings from "stringlist1" that had a match
in the input file.

Is it a straighforward call or should I iterate through the file line by
line and then do a match/comparison for all items in the stringlist?

Thanks for your time,
V!
 
VC said:
I have a list of strings (Array, Collection or some store) stringlist1
I have an input text file. datafile1.txt
Given the list of strings and this input file, I want to parse the file and
see if the strings are found in the file. The result from this operation is
a list that contains only those strings from "stringlist1" that had a match
in the input file.

Is it a straighforward call or should I iterate through the file line by
line and then do a match/comparison for all items in the stringlist?
Click to expand...

There's no call that will do that for you, so you're right, you'll have to
iterate over the lines in the file. I guess you'll be better off (because
it's faster) using the String.IndexOf method instead of regular
expressions as long as your match list really contains regular strings only.


Oliver Sturm
 
Thanks a lot oliver. I am doing exactly what you recommended.
Thanks for your time, Have a great day!!!
V!
 
There's no call that will do that for you, so you're right, you'll have to
only.
Click to expand...

Actually, I would read the whole file into a single string, then iterate
through the list of items and search using String.IndexOf. Much faster than
a line-by-line access of the file unless you have some need to know what line
something's on.
 
Chuck said:
Actually, I would read the whole file into a single string, then iterate
through the list of items and search using String.IndexOf. Much faster
than
a line-by-line access of the file unless you have some need to know what
line
something's on.
Click to expand...

Or unless your file is just a too large for that. Line by line reading is
extremely easy to code and much more efficient memory-wise, so I would
usually opt for that - why do you believe that reading the whole file into
a string should be significantly faster?


Oliver Sturm
 
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