On Tue, Feb 8, 2011 at 3:13 PM, Max <more4less@sina.com> wrote:
I'm using boost::tokenizer to do some simple parsing of data file in a format specified by the following rules:
- One record of several fields in a single line
- Adjacent data fields in a record separated by space char's(space or tab), with or without ","
- String without space(s), with or without quotation marks
- String with space(s), with quotation marks
One example of a 4-field-per-record file is like:
"string 2" 3 4 5 4.3
"String", 2, 3.04 4 3
AnyOtherText, 2, 3.04 4 3
I normally use boost.regex's regex_token_iterator for this sort of task. Try the following regex: "([^"]*)"|(?:^|[[:space:],])+([^[:space:],]+)(?:$|[[:space:],])+ and tell regex_token_iterator to extract matches 1 and 2. The above regex has a couple of quirks: "a""b" will be taken as two fields, "a" and "b". a,,b will be taken as two fields, not three. To read the file line by line, simply use std::getline. Yechezkel Mett