@tbonfort We're making progress - the validation block is now written to the mapfile :) However, this appears to have been a separate bug as the validation and runtime substitution itself still doesn't appear to be working from within a CLASS. The following is the standalone mapfile I'm using to test:

MAP
    NAME "Testing"
    EXTENT -0.5 50.977222 0.5 51.977222
    IMAGETYPE PNG
    IMAGECOLOR 255 255 255
    STATUS ON
    SIZE 200 200

    PROJECTION
        "init=epsg:4326"
    END

    LAYER
        NAME "POLYGON"
        TYPE POLYGON
        PROJECTION
            "init=epsg:4326"
        END
        STATUS ON # DEFAULT
        DATA "polygon"
        PROCESSING "ITEMS=FNAME"
        FEATURE
            WKT "POLYGON ((-0.25 51.227222,-0.25 51.727222,0.25 51.727222,0.25 51.227222,-0.25 51.227222))"
            ITEMS "A Polygon"
        END

        #METADATA
        #    "fname_validation_pattern" "^[a-zA-Z ]+$" # works
        #END

        #VALIDATION
        #    "fname"     "^[a-zA-Z ]+$" # works
        #END

        CLASSITEM "FNAME"
        CLASS
            NAME "0"
            EXPRESSION ("[FNAME]" eq "%fname%")

            #METADATA
            #    "fname_validation_pattern" "^[a-zA-Z ]+$" # doesn't work
            #END

            VALIDATION
                "fname"     "^[a-zA-Z ]+$" # doesn't work
            END

            STYLE
                COLOR 255 153 102
                OUTLINECOLOR 0 0 204
            END
        END
    END
END

An request to this mapfile along the following lines...

http://localhost/cgi-bin/mapserv?map=/tmp/test.map&mode=map&layer=POLYGON&fname=A+Polygon

...should yield the following image:

but instead fails to draw the orange polygon.

msCopyMap() does not copy VALIDATION blocks #4596

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`msCopyMap()` does not copy `VALIDATION` blocks #4596