This example will return 2 because it is counting the number of occurrences of 't' in the string. Let's count the number of times the character 't' appears in a string.įor example: SELECT REGEXP_COUNT ('TechOnTheNet is a great resource', 't') Let's start by looking at the simplest case. By default, whitespace characters are matched like any other character. By default, expression is assumed to be a single line. By default, the period is a wildcard.Įxpression is assumed to have multiple lines, where ^ is the start of a line and $ is the end of a line, regardless of the position of those characters in expression. It can be a combination of the following: ValueĪllows the period character (.) to match the newline character. It allows you to modify the matching behavior for the REGEXP_COUNT function. If omitted, it defaults to 1 which is the first position in the string. It is the position in string where the search will start. Matches the preceding pattern at least n times, but not more than m times. Matches the preceding pattern at least n times. Matches the preceding pattern zero or one occurrence. Matches the preceding pattern one or more occurrences. Matches the preceding pattern zero or more occurrences. Matches the beginning of a string or matches at the end of a string before a newline character. Matches one collation element that can be more than one character. Matches the nth subexpression found within ( ) before encountering \n. Matches at least m times, but no more than n times. Used to group expressions as a subexpression. Used to specify a nonmatching list where you are trying to match any character except for the ones in the list. Used to specify a matching list where you are trying to match any one of the characters in the list.
Used like an "OR" to specify more than one alternative. If used with a match_parameter of 'm', it matches the end of a line anywhere within expression. If used with a match_parameter of 'm', it matches the start of a line anywhere within expression. It can be a combination of the following: Value The regular expression matching information. string can be CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB. The syntax for the REGEXP_COUNT function in Oracle is: REGEXP_COUNT( string, pattern ] ) Parameters or Arguments string The string to search.
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