FELINE (Find Emission LINEs) combines a fully parallelized galaxy line template matching with the matched filter approach for individual emission features of LSDcat (ascl:1612.002). For the 3D matched filtering, the complete data cube is first median filtered to remove all continuum sources, and then cross-correlated with a template of an isolated emission feature in two spatial and one spectral dimension. FELINE then evaluates the likelihood in each spectrum of the cube for emission lines at the positions provided by a given redshift and a certain combination of typical emission features.