HELPLIB.HLB  —  RTL Routines, LIB$  LIB$MATCHC
    The Match Characters, Return Relative Position routine searches a
    source string for a specified substring and returns an index,
    which is the relative position of the first occurrence of a
    substring in the source string. The relative character positions
    returned by LIB$MATCHC are numbered 1, 2, . . . , n. Thus, zero
    means that the substring was not found.

    Format

      LIB$MATCHC  sub-string ,source-string
Additional Information: explode extract
Returns Arguments
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