There are so many scenarios where user needs to calculate the occurrences in the string. Unfortunately, it does not work in 11g, which you said you are on. Is a regular expression to be matched. Syntax: REGEXP_COUNT (source_char, pattern [, position [, match_param]]) Parameters: REGEXP_COUNT - Returns the number of occurrences of the regular expression in the string. The Oracle REGEXP_INSTR function lets you search a string for a regular expression pattern, and returns a number that indicates where the pattern was found. This finds the exact number of occurrences of the preceding character or expression. Purpose. The function evaluates strings using characters as defined by the input character set. Sub-expression support was added to all regular expression functions by adding a parameter to each function to specify the sub-expression in the pattern match. Question: What does the regexp_count operator do? SELECT ENAME, REGEXP_SUBSTR(ENAME,'DAM') SUBSTR, REGEXP_INSTR(ENAME, 'T') INSTR, REGEXP_COUNT - Returns the number of occurrences of the regular expression in the string. It returns an integer indicating the number of occurrences of a pattern. SELECT REGEXP_COUNT ('This is a oracle 11g and 12c substring expression', 'i') FROM dual; Output 4. Answer: The regexp_count counts the number of occurrences of a string. Extract the count of substring “is” presence in the given input string. Can you show an example of using regexp_count? Description. Use Regexp_Count function in Oracle to count the number of occurrences of a string in Oracle using SQL. For example SELECT REGEXP_SUBSTR('Txa233141b … How can I count the number of times that a particular character occurs in a column in Oracle? SELECT REGEXP_COUNT ('This is a oracle 11g and 12c substring expression', 'is') FROM dual; Output 2 Syntax: RegExp_Count(String, CharacterToFindOccurrences) SELECT REGEXP_COUNT ('abc, skm, 23, a,,', ',') FROM DUAL. B) Use a LATERAL inline view (only works in Oracle 12c or later) This version will support any number of occurrences and should perform better since you are not duplicating the data 50 times to only find one or two occurrences. For example, to find expressions matching ‘eeeeee’ you would use a pattern of ‘e{6}’. The Oracle/PLSQL REGEXP_INSTR function is an extension of the INSTR function.It returns the location of a regular expression pattern in a string.This function, introduced in Oracle 10g, will allow you to find a substring in a string using regular expression pattern matching. I'm using Oracle 11g and I would like to use the REGEXP_SUBSTR to match all the occurrences for a given pattern. The Oracle REGEXP_COUNT function is used to count the occurrences of the pattern in the string. Here is the detail of each argument: string (mandatory). For example, if I have a table FOO that has data like a,ABC,def and 2,3,4,5, I want to count the number of times that a comma appears in the data. Oracle 11g extends the set of available expressions with REGEXP_COUNT. Sub-expression support was added to all regular expression functions by adding a parameter to each function to specify the sub-expression in the pattern match. Extract the count of character “i” presence in the given input string. REGEXP_COUNT complements the functionality of the REGEXP_INSTR function by returning the number of times a pattern occurs in a source string. If no match is found, then the function returns 0. The Oracle REGEXP_COUNT function is used to count the number of times that a pattern occurs in a string. 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