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A sequence search method was developed for searching for regular frequencyspacing in delta Scuti stars by visual inspection and algorithmic search. Thesample contains 90 delta Scuti stars observed by CoRoT. An example is given torepresent the visual inspection. The algorithm (SSA) is described in detail.The data treatment of the CoRoT light curves, the criteria for frequencyfiltering and the spacings derived by two methods (three approaches: VI, SSAand FT) are given for each target. Echelle diagrams are presented for 77targets, for which at least one sequence of regular spacing was identified.Comparing the spacing and the shifts between pairs of echelle ridges revealedthat at least one pair of echelle ridges is shifted to midway between thespacing for 22 stars. The estimated rotational frequencies compared to theshifts revealed rotationally split doublets, triplets and multiplets not onlyfor single frequencies, but for the complete echelle ridges in 31 delta Scutistars. Using several possible assumptions for the origin of the spacings, wederived the large separation ($\Delta\nu$), which are distributed along themean density versus large separations relation derived from stellar modelsSuarez 2014.

Unexpected series of regular frequency spacing of delta Scuti stars in the non-asymptotic regime -- II. Sample -- echelle diagrams and rotation