Regular Expression not working!

Hadeus

I have tried using this negative lookahead ".(?![a-z])" to split sentences based on the match - "dot, not followed by any characters in "a-z". It doesn't seem to work as this whole string is being considered as the pattern rather than the desired set. Please help!!

sirop

bq. Note: The C++ compiler transforms backslashes in strings. To include a \ in a regexp, enter it twice, i.e. \.

http://qt-project.org/doc/qt-4.8/qregexp.html#characters-and-abbreviations-for-sets-of-characters

Hadeus

I had done that(forgot to mention here) ..still no result!!

jazzco

Can you pass your code example with a "text to be parsed"?

sirop

Try
@QStringList field = str.split(".(?![a-z])");@

Maybe with \.

jazzco

This way you are getting a string comparison. If you want the .split function to use a regular expression, you must pass a QRegExp:
@QStringList field = str.split(QRegExp(".(?![a-z])"));@

Hadeus

Yes I I appreciate your help, Sirop. But, I have already tried almost everything before posting here, and unfortunately nothing works. Here's my snippet :-
QString st = "HELLO HOW ARE YOU.a THANK HOW YOU.2ELLO NOT YOU.";
QStringList ql = st.split("\.(?![a-z])");
qDebug()<< ql.at(0);

OUTPUT: "HELLO HOW ARE YOU.a THANK HOW YOU.2ELLO NOT YOU"

Hadeus

jazco let me try this..

Hadeus

yeah jazzco yours works with double backslash! Thanks a ton, jazzco and sirop.

SGaist

Hi,

Double backslashes are needed because you are still writing a string, so you need escape the backslash properly in order to obtain the correct regexp. You can test and validate regular expressions for QRegExp with the regular expression example from Qt's sources.

Hadeus

Yes. I get that.