tuple_strrstr — 在字符串元组中向后搜索字符串。
tuple_strrstr searches within the strings of the input tuple
String for the strings of the input tuple ToFind. Both
input tuples may only consist of strings. Otherwise tuple_strrstr
returns an error. In any case backward search is used, i.e., every string is
examined from its last to its first character. If String contains
only one string, all strings of ToFind are searched in it. Thus, the
output tuple consists of as many elements as ToFind. Whenever a
searched string has been found, the position of its first occurrence gets
stored in the output tuple Position (positions in strings are
counted starting with 0). If a string can not be found, -1 will be returned
instead of its position. If both input tuples show the same number of
elements, the strings are searched elementwise. I.e., the first string of
ToFind is searched within the first string of String, the
second string of ToFind is searched within the second string of
String and so on. The results of the elementwise searches are
returned with Position that contains as many elements as
String and ToFind. If ToFind only contains one
string, this is searched within all strings of String. Thus, in this
case Position consists of as many elements as String. If
both input tuples contain more than one element and the number of elements
differs for the input tuples, tuple_strrstr returns an error.
If either or both of the input tuples are empty, the operator returns an empty tuple.
The position references Unicode code points. One Unicode code point may be
composed of multiple bytes in the UTF-8 string. If the position should
reference the raw bytes of the string, this operator can be switched to byte
mode with set_system('tsp_tuple_string_operator_mode','byte')。If
'filename_encoding' is set to 'locale' (legacy), this
operator always uses the byte mode.
For general information about string operations see Tuple / String Operations。
HDevelop provides an in-line operation for tuple_strrstr,
which can be used in an expression in the following syntax:
Position := strrstr(String, ToFind)
String (输入控制) string(-array) → (string)
Input tuple with string(s) to examine.
ToFind (输入控制) string(-array) → (string)
Input tuple with string(s) to search.
Position (输出控制) integer(-array) → (integer)
Position of searched string(s) within the examined string(s).
tuple_strstr,
tuple_strlen,
tuple_strchr,
tuple_strrchr,
tuple_substr,
tuple_str_first_n,
tuple_str_last_n,
tuple_split,
tuple_environment
基础