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... ${$[SUBSTRING$] substring$} $| ${PCRE pcre$}$|${REGEX regex_ref$} ... .
1. ... $[SUBSTRING$] substring.
2. ... ${PCRE pcre$}$|${REGEX regex_ref$}
Definition of a search pattern for the statements FIND
and FIND IN TABLE. The system can either
search for exactly one substring substring or for a substring that matches a regular expression behind PCRE or REGEX.
The statements REPLACE and REPLACE IN TABLE use the same search pattern.
... $[SUBSTRING$] substring.
In this variant, a search is performed for the exact occurrence of a substring specified in a character-like or byte-like operand substring. substring is a
character-like expression position. The optional word SUBSTRING can be specified for emphasis.
If substring is either an empty string or is of type c, n, d, or t
and only contains blanks, a search is performed for an empty substring. This is only possible when searching
for the first occurrence, and the empty substring is always found before the first character or byte.
In character string processing, the trailing blanks are ignored for substring data objects of fixed length.
If trailing blanks are not to be ignored in the substring, substring must have the data type string.
Search for all occurrences of the string "now" in a text string literal. The offsets 11 and 24 of both occurrences are shown in the output.
Search for all occurrences of the string "now" in a text string literal using a WHILE loop. After
every successful search, the search range is redefined to start after the occurrence. In this way, all
occurrences of the search pattern could be found even before the addition ALL OCCURRENCES was introduced.
... ${PCRE pcre$}$|${REGEX regex_ref$}
In this variant, a search is performed for a substring that matches a regular expression specified in pcre or regex_ref.
pcre is a character-like expression position.
In searches using a regular expression, special search patterns can be specified that allow further conditions including forecast conditions.
An empty string in pcre is not a valid regular expression and raises an exception. A character
string is empty if pcre is either an empty string or is of type c, n, d, or t and only contains blanks.
The search uses PCRE regular expression syntax and finds the 'ab' from offset 3.
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