Regex |分隔符“%”类似“%”| |替换（替换（替换（分隔符| | | | | | | | |针| | | | | | | | | | | | | | | | | | | |。。。我这样做是为了确保打捆针和分离器都能安全逃脱。我还对转义字符进行了转义，以确保如果

---

|分隔符“%”类似“%”| |替换（替换（替换（分隔符| | | | | | | | |针| | | | | | | | | | | | | | | | | | | |。。。我这样做是为了确保打捆针和分离器都能安全逃脱。我还对转义字符进行了转义，以确保如果针头包含转义字符，它将不会被特殊处理。虽然这在某些情况下会起作用，但仍有可能针头包含特殊字符，因此您的答案不是一个完整的解决方案。不过还是要谢谢你：）虽然这在某些情况下是可行的，但仍有可能针会包含特殊字符，因此你的答案不是一个完整的解决方案。不过还是要谢谢你：）

CREATE OR REPLACE 
FUNCTION list_contains(needle_    IN VARCHAR2,
                       haystack_  IN VARCHAR2,
                       separator_ IN VARCHAR2 DEFAULT ',')
RETURN INTEGER
  IS
BEGIN
  IF regexp_like(haystack_, '(^|' || separator_ || ')' || needle_ || '(' || separator_ || '|$)') THEN
    RETURN 1;
  ELSE
    RETURN 0;
  END IF;
END list_contains;

list_conains('eve','john,eve,maria,steve') => 1

IF separator_ || haystack_ || separator_ LIKE '%'||separator_||needle_||separator_||'%' THEN
   RETURN 1;
ELSE
   RETURN 0;
END IF;

IF separator_ = '%' OR separator_ = '_'
THEN
  separator_ := '\' || separator_;
END IF;

IF separator_ || haystack_ || separator_ LIKE
     '%' || separator_ || needle_ || separator_ || '%' ESCAPE '\'
THEN
  RETURN 1;
ELSE
  RETURN 0;
END IF;

  IF regexp_like(haystack_, '(^|\' || separator_ || ')' || needle_ || '(\' || separator_ || '|$)') THEN

CREATE OR REPLACE 
FUNCTION list_contains(needle_    IN VARCHAR2,
                       haystack_  IN VARCHAR2,
                       separator_ IN VARCHAR2 DEFAULT ',')
return number AS
  l_return_count number := 0;
BEGIN
  with haystack_ary as (
    select extractvalue(x.column_value, 'e') as val
    from xmltable ('e' passing xmlparse( content  '<e>' || replace(haystack_, separator_, '</e><e>') || '</e>')) x
  )
  select 
  --count(1)
  --return as a "bool"(1=true,0=false)
  decode(count(1), 0, 0, 1)
  into l_return_count
  from haystack_ary
  where lower(needle_) = lower(haystack_ary.val);

  return l_return_count;
END;

SELECT REGEXP_REPLACE('some.string[with(special)reg-exp]characters', '([][)(}{.$*+?,|^\])', '\\\1') "REGEXP_REPLACE" FROM dual;

select haystack_, needle_, separator_, instr(separator_||haystack_||separator_, separator_||needle_||separator_) result_, expected_
from (
    select 'john,eve,maria,steve' as haystack_ , 'eve' as needle_, ',' as separator_, '>0'as expected_ from dual union all
    select 'john,eve,maria,steve' as haystack_ , 'john' as needle_, ',' as separator_, '>0'as expected_ from dual union all
    select 'john,eve,maria,steve' as haystack_ , 'joh' as needle_, ',' as separator_, '=0'as expected_ from dual union all
    select 'john,eve,maria,steve' as haystack_ , 'steve' as needle_, ',' as separator_, '>0'as expected_ from dual union all
    select 'john,eve,maria,steve' as haystack_ , 'stev' as needle_, ',' as separator_, '=0'as expected_ from dual union all
    select 'john,eve,maria,steve' as haystack_ , 'teve' as needle_, ',' as separator_, '=0'as expected_ from dual union all
    select 'john.maria.steve' as haystack_ , 'eve' as needle_, '.' as separator_, '=0'as expected_ from dual union all
    select 'john_maria_steve' as haystack_ , 'eve' as needle_, '_' as separator_, '=0'as expected_ from dual union all
    select 'john%maria%steve' as haystack_ , 'eve' as needle_, '%' as separator_, '=0'as expected_ from dual
) t;

HAYSTACK_            NEEDLE_ SEPARATOR_ RESULT_ EXPECTED_
john,eve,maria,steve eve     ,          6       >0
john,eve,maria,steve john    ,          1       >0
john,eve,maria,steve joh     ,          0       =0
john,eve,maria,steve steve   ,          16      >0
john,eve,maria,steve stev    ,          0       =0
john,eve,maria,steve teve    ,          0       =0
john.maria.steve     eve     .          0       =0
john_maria_steve     eve     _          0       =0
john%maria%steve     eve     %          0       =0