particle N4 common casual
ねえ — emphatic/drawn-out sentence-final ね
ねえ
Builds on ね
A full written guide for ねえ is on the way.
This point is mapped in the grammar tree, but its examples, formation table and usage notes haven't been written yet. The fastest way to learn it now is to meet it in real sentences inside Jengo.
See ねえ in real sentences
Jengo shows ねえ the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled with reference to A Dictionary of Advanced Japanese Grammar. Editorial confidence: low.