hi, i am new to fme desktop I have in a csv lines stored in a column like [[x,y],[x,y],[x,y],[x,y]] and i dont know how to transform into fme line geometry Please help

One solution is to turn the coordinate list into a WKT string (Well Known Text) using some RegEx in an AttributeManager, and feed the results to a GeometryReplacer.

LINESTRING (@ReplaceRegEx(@ReplaceRegEx(@Value(CoordList),"(\d+),(\d+)",\1 \2),(\[|\]),""))

WKT polyline representation: LINESTRING (x y, x y, x y,x y)

@ReplaceRegEx(@Value(CoordList),"(\d+),(\d+)",\1 \2): replace a comma standing between two numbers with a space (a number may contain digits and a dot)

@ReplaceRegEx(......,(\[|\]),""): replace any [ or ] with nothing (both [ and ] need to be escaped with a \ because they are special chararters in regular expressions).

You may test regular expressions in the StringReplacer.

Thank you very much for your help. Both solutions are very good. Thank you