Hi Chen, You can do one line at a time also.
(Also, if you read whole file, convert it into a string and work on that string, the original file will not change.) - Regards, Shashi. On 1/4/06, chen li <[EMAIL PROTECTED]> wrote: > > Thanks Chris and others for the information. > > Chris, I have another question: I have a file > containing multiple lines and it looks like this: > > (line 1).....chen..... > (line 2).............. > (line 3) chen......... > > If I read the whole file at once and change it into a > string I have no problem using regular expression to > find out the word "chen". But it looks like a little > bit unnatural for me because it changes the file's > format. Is it possible to do the match without change > the file format? One way I think is to use a loop to > read the file line by line and do the match for each > line. I wonder if this is the best way to get the job > done. > > Once again thank you very much, > > Li > > > --- Chris Charley <[EMAIL PROTECTED]> wrote: > > > > > ----- Original Message ----- > > From: "chen li" <[EMAIL PROTECTED]> > > > > > > > Hi all, > > > > > > Here is my problem: > > > > > > my $string="chen schen"; > > > > > > I want to use regular expression to find the exact > > > match in the string. So when I want to match > > "chen" I > > > expect "chen" only. > > > But use the following line I get both "chen" and > > > "schen" at the same time. > > > $string=~/chen/g; > > > > > > How do I get what I expect? > > > > Hi Chen > > > > You can get the results by adding a \b before and > > after your reg expression. > > \b is a boundary between a word and a non-word > > character. (A word character > > is a-z, A-Z, 0-9, or underscore, _).So, for your > > example, schen wouldn't > > match then because the 's' preceding 'c' is a word > > character and so the \b > > wouldn't be true. But, it would match chen because > > the (non) character > > (beginning of the string) preceding the 'c' would > > make \b true. > > > > $string=~/\bchen\b/g; > > > > MATCH > > "chen " > > "#chen" > > "here is a chen and another chen" > > "chen's" (the apostrophy is a non-word char) > > > > NO MATCH > > "schen" > > "chens" > > > > Chris > > > > > > > > -- > > To unsubscribe, e-mail: > > [EMAIL PROTECTED] > > For additional commands, e-mail: > > [EMAIL PROTECTED] > > <http://learn.perl.org/> > > <http://learn.perl.org/first-response> > > > > > > > > > > > __________________________________________ > Yahoo! DSL – Something to write home about. > Just $16.99/mo. or less. > dsl.yahoo.com > > > -- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > <http://learn.perl.org/> <http://learn.perl.org/first-response> > > >
