List of field mapping grammar functions

The following table describes the grammar functions available when creating or modifying field mapping expressions in Source Manager:

Function	Use
chop	Returns an input string with the last length characters removed.
first	Returns the first length characters of an input string.
getdicomsequence	Looks for a sequence within the DICOM header that matches the tag, and for every item within that sequence, evaluates match_expression and compares the value to match_value. If the comparison is true, then it evaluates return_expression and returns that as the value.
getdicomstring	Extracts the contents of the defined DICOM element from the image header.
hex	Converts string into the unsigned integer value it corresponds to.
in	Returns T (for true) or F (for false), depending on whether an expression's value matches one of a list of values.
index	Returns the position within a list of values for the value that corresponds to the input expression.
last	Returns the last length characters of an input string.
padl	Returns the concatenation of a second string with an input string.
padt	Returns the concatenation of an input string with a second string.
reverse	Returns an input string with the characters in reverse order.
select	Returns the value within a list of values at the index position within the list defined by the input expression.
squeeze	Returns an input string with all garbage characters removed.
stripl	Returns an input string with its leading garbage characters removed.
stript	Returns an input string with its trailing garbage characters removed.
sub	Returns the substring within an input string defined by offset and length.
subfield	Parses a string into a series of fields and returns the requested field.