SELECT ENAME, REGEXP_SUBSTR(ENAME,'DAM') SUBSTR, REGEXP_INSTR(ENAME, 'T') INSTR, 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. If no match is found, then the function returns 0. How can I count the number of times that a particular character occurs in a column in Oracle? Can you show an example of using regexp_count? REGEXP_COUNT - Returns the number of occurrences of the regular expression in the string. pattern (mandatory). There are so many scenarios where user needs to calculate the occurrences in the string. For example, to find expressions matching ‘eeeeee’ you would use a pattern of ‘e{6}’. 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. The Oracle REGEXP_COUNT function is used to count the number of times that a pattern occurs in a string. I'm including it only for completeness. Syntax: REGEXP_COUNT (source_char, pattern [, position [, match_param]]) Parameters: SELECT REGEXP_COUNT ('This is a oracle 11g and 12c substring expression', 'i') FROM dual; Output 4. 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. Description of the illustration regexp_count.gif. Is a regular expression to be matched. Extract the count of character “i” 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. For example SELECT REGEXP_SUBSTR('Txa233141b … Question: What does the regexp_count operator do? The Oracle REGEXP_COUNT function is used to count the occurrences of the pattern in the string. The function evaluates strings using characters as defined by the input character set. Unfortunately, it does not work in 11g, which you said you are on. 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. 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. Syntax: RegExp_Count(String, CharacterToFindOccurrences) SELECT REGEXP_COUNT ('abc, skm, 23, a,,', ',') FROM DUAL. Purpose. It returns an integer indicating the number of occurrences of a pattern. Description. Answer: The regexp_count counts the number of occurrences of a string. 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. 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. REGEXP_COUNT - Returns the number of occurrences of the regular expression in the string. REGEXP_COUNT complements the functionality of the REGEXP_INSTR function by returning the number of times a pattern occurs in a source string. Use Regexp_Count function in Oracle to count the number of occurrences of a string in Oracle using SQL. 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