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