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This little regex script which removes the Z and M elements from a WKT (Well known text)
SELECT
  --below contains X, Y, Z, M
  sde.st_astext(shape)

  --below contains just X and Y
,REGEXP_REPLACE(replace(replace(sde.st_astext(shape),'-',''),'ZM ','') ,
    '(( [0-9]+\.[0-9]{8}){2})( [0-9]+\.[0-9]{8}){2}',  '\1') geo_text

FROM MY_ESRI_GEOTABLE;



This would (for example) convert the following WKT text, from this:

LINESTRING ZM ( 582998.53240000 4612664.46140000 0.00000000 15.59552480, 582994.14500000 4612880.96500000 0.00000000 15.73008122)

to this:

LINESTRING ( 582998.53240000 4612664.46140000, 582994.14500000 4612880.96500000)

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