Here i am not using fixed string,, even i went through the examples also.
The format of the file is as below and user will be writing some more values into the file maximum is 99 points and simultaneously user need to read the values.

Datum X Y Z
0 123 456 789
1 321 654 987
2 345 243 809
......
.....
...... and so on

now i need to search for Datum number i.e., first column only then i need to read the corresponding line split the Datum, X, Y, Z values and store in 3 different variables.

QRegExp rx ( "(\\d+)" );
rx.search ( "Datumno_Val" );

is my code is correct or not.