REGEXP_COUNT complements the functionality of the REGEXP_INSTR function by returning the number of times a pattern occurs in a source string. SELECT REGEXP_COUNT ('This is a oracle 11g and 12c substring expression', 'i') FROM dual; Output 4. Syntax: RegExp_Count(String, CharacterToFindOccurrences) SELECT REGEXP_COUNT ('abc, skm, 23, a,,', ',') FROM DUAL. Extract the count of substring “is” presence in the given input string. 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. Oracle 11g extends the set of available expressions with REGEXP_COUNT. This finds the exact number of occurrences of the preceding character or expression. Syntax: REGEXP_COUNT (source_char, pattern [, position [, match_param]]) Parameters: The REGEXP_COUNT() function evaluates the string based on the pattern and returns the number of times that a pattern occurs in the string.If the function finds no match, it returns 0. 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. REGEXP_COUNT - Returns the number of occurrences of the regular expression in the string. There are so many scenarios where user needs to calculate the occurrences in the string. It returns an integer indicating the number of occurrences of a pattern. pattern (mandatory). For example SELECT REGEXP_SUBSTR('Txa233141b … SELECT ENAME, REGEXP_SUBSTR(ENAME,'DAM') SUBSTR, REGEXP_INSTR(ENAME, 'T') INSTR, 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. Description. The Oracle REGEXP_COUNT function is used to count the occurrences of the pattern in the string. Is a regular expression to be matched. Use Regexp_Count function in Oracle to count the number of occurrences of a string in Oracle using SQL. The Oracle REGEXP_COUNT function is used to count the number of times that a pattern occurs in a string. Can you show an example of using regexp_count? I'm including it only for completeness. Unfortunately, it does not work in 11g, which you said you are on. Is the input string to search for the pattern. 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. SELECT REGEXP_COUNT ('This is a oracle 11g and 12c substring expression', 'is') FROM dual; Output 2 Extract the count of character “i” presence in the given input string. Below is the example to count the number of occurrences of Comma in a string. Here is the detail of each argument: string (mandatory). For example, to find expressions matching ‘eeeeee’ you would use a pattern of ‘e{6}’. Question: What does the regexp_count operator do? I'm using Oracle 11g and I would like to use the REGEXP_SUBSTR to match all the occurrences for a given pattern. 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. REGEXP_COUNT - Returns the number of occurrences of the regular expression in the string. There are so many situations where user need to calculate the count of different operators like comma or pipe operator. Answer: The regexp_count counts the number of occurrences of a string. Description of the illustration regexp_count.gif. 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