正则表达式函数待完善

Regular Expression Function Syntax
The four regular expression functions have the following syntax. You can specify regular expressions in their pattern argument.
• REGEXP_LIKE(text, pattern[, options])
• REGEXP_INSTR(text, pattern[, pos[, occurrence[, return[, options]]]])
• REGEXP_SUBSTR(text, pattern[, pos[, occurrence[, options]]])
• REGEXP_REPLACE(text, pattern[, replace [, pos[, occurrence[, options]]]])

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