正则表达式单引号仅在select和from之间，不更改开始和结束引号

Question

i'm using php and i want to replace single quotes in a oracle sql query.

i have something like this :

select 'this is test' for 'stack overflow'' , 'another' single quote was around here' from testtable where id='test' and another='test2'

i am using oracle so the escape character is double single quote.

my issue is to find single quotes just only between select and from statement, replacing shouldn't remove the first single quote at start and end of each field.

answer should be something like this

select 'this is test'' for ''stack overflow''' , 'another'' single quote was around here' from testtable where id='test' and another='test2'

the number of fields can be vary. in my example it had two field each one contain single quote. but sometimes fields contain quote and sometimes not, sometimes they come after each other and some times not.

i tired different regexp. try to come up with a solution but no luck

so my question is how do i implement this? which php funciton or what regex?

Answer 1

I don't think you can do what you want directly. If you for example have 'field one', 'field' two' it could be interpreted as either 'field one', 'field'' two' or 'field one '', ''field'' two' .

You might want to try something like this instead, if possible:

//First put the field names in an array $fields
...

//Then you create the query string like this
$sql = "select '" . implode("', '", str_replace("'", "''", $fields) ) . "' from testtable where id='test' and another='test2'";