REGEXP_SUBSTR函数格式如下: function REGEXP_SUBSTR(String, pattern, position, occurrence, modifier) __srcstr :需要进行正则处理的字符串 __pattern :进行匹配的正则表达式 __position :起始位置,从第几个字符开始正则表达式匹配(默认为1) __occurrence :标识第几个匹配组,默认为1 __modifier :模式('i'不...
Oracle REGEXP_SUBSTR functionLast update on August 06 2024 10:36:47 (UTC/GMT +8 hours) DescriptionThe REGEXP_SUBSTR function use used to return the substring that matches a regular expression within a string. This function returns NULL when no matches are found. An empty string can be ...
1,REGEXP_LIKE :与LIKE的功能相似 2,REGEXP_INSTR :与INSTR的功能相似 3,REGEXP_SUBSTR :与SUBSTR的功能相似 4,REGEXP_REPLACE :与REPLACE的功能相似 它们在用法上与Oracle SQL 函数LIKE、INSTR、SUBSTR 和REPLACE 用法相同, 但是它们使用POSIX 正则表达式代替了老的百分号(%)和通配符(_)字符。 POSIX 正则表达式...
This function complies with the POSIX regular expression standard and the Unicode Regular Expression Guidelines. For more information, refer toOracle Regular Expression Support. source_charis a character expression that serves as the search value. It is commonly a character column and can be of any ...
FUNCTION CheckName(NameStr in VARCHAR2) RETURN integer As BEGIN --符合返回1,不符合返回0 if(NameStr is null or length(NameStr)<2) then return 0; else if(NameStr like '%未取名%') then RETURN 0; end if; if regexp_like(NameStr,'^([a-z]+|[0-9]+|[A-Z]+)$') then ...
The OracleREGEXP_SUBSTR()function accepts 6 arguments: 1)source_string is a string to be searched for. 2)pattern is the regular expression pattern that is used to search for in the source string. 3)start_position is positive integer that indicates the starting position in the source string ...
Oracle 正则表达式函数-REGEXP_SUBSTR 使用例子 原文在这戳 REGEXP_SUBSTR 5个参数 第一个是输入的字符串 第二个是正则表达式 第三个是标识从第几个字符开始正则表达式匹配。(默认为1) 第四个是标识第几个匹配组。(默认为1) 第五个是是取值范围:
使用regexp_substr函数可以根据正则表达式模式拆分名称字符串。regexp_substr函数是Oracle数据库中的一个函数,用于从字符串中提取满足指定模式的子字符串。 具体使用方法如下:...
Controls which occurrence of a pattern match in the string to return. By default, the function returns the position of the first matching substring. Use this parameter to find the position of subsequent matching substrings. For example, setting this parameter to 3 returns the position of the th...
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