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Determines the relative offset of an escaped delimiter in relation to
a delimiter. Depending on the used delimiter and escaped delimiter
tokens the position where to search for an escaped delimiter is
different. If, for instance, the dot character (".") is
used as delimiter, and a doubled dot ("..") as escaped
delimiter, the escaped delimiter starts at the same position as the
delimiter. If the token "\." was used, it would start one
character before the delimiter because the delimiter character
"." is the second character in the escaped delimiter
string. This relation will be determined by this method. For this to
work the delimiter string must be contained in the escaped delimiter
string.