occurrenceis a positive integer indicating which occurrence ofpatterninsource_charOracle should search for. The default is 1, meaning that Oracle searches for the first occurrence ofpattern. Ifoccurrenceis greater than 1, then the database searches for the second occurrence beginning with the first ch...
语法 Oracle数据库中的REGEXP_SUBSTR函数的语法是: REGEXP_SUBSTR(source_char, pattern [, position [, occurrence [, match_parameter ]]]) 1. 參数 source_char 搜索字符串。能够是随意的数据类型char。VARCHAR2。nchar,CLOB,NCLOB类型 pattern 正則表達式 position 可选。搜索在字符串中的開始位置。假设省略,...
This Oracle tutorial explains how to use the Oracle / PLSQL REGEXP_SUBSTR function with syntax and examples. This function, introduced in Oracle 11g, will allow you to extract a substring from a string using regular expression pattern matching.
Oracle 12c, Oracle 11g Examples: Oracle REGEXP_SUBSTR function The following example examines the string, looking for the first substring bounded by commas. Oracle Database searches for a comma followed by one or more occurrences of non-comma characters followed by a comma and returns the substri...
Examples Select the first substring of letters that end with "thy." => SELECT REGEXP_SUBSTR('healthy, wealthy, and wise','\w+thy'); REGEXP_SUBSTR --- healthy (1 row) Select the first substring of letters that ends with "thy" starting at the second character in the string. => SELE...
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Oracle数据库中的REGEXP_SUBSTR函数的语法是: REGEXP_SUBSTR(source_char,pattern[, position [, occurrence [, match_parameter ]]]) 參数 source_char 搜索字符串。能够是随意的数据类型char。VARCHAR2。nchar,CLOB,NCLOB类型 pattern 正則表達式 position ...