Question

Can anyone suggest me a solution in Regular Expression, to match a string if it does not exist in the given string.

Suppose I have a String

Rohan is going to Home

and I don’t want that

Going to

string should exist, then it will not return. But if the string does not contain contains “going to”, then string will be returned

Valid

• Rohan is at Home

Invalid

• Rohan is going to Home

I have heard that regex isn’t well suited to negate something (except a single character). Regex is more intended to match strings, not “not match” them. Still if someone have solution please suggest in Regular Expresion

I have tried to create a Regular Expression,but didn’t get success till now.

SELECT   1 
  FROM   DUAL 
 WHERE   REGEXP_LIKE (' Rohan is 12 home'
                       , '^\s[^going to])$','i'); 

Answer 1

Try this, which uses a negative look ahead:

^(?!.*going to.*$)