regex - Regular Expression should not match other prefixes -

if instance have these words

• john=14
• adam=21
• ben=11
• john=18
• johan=17
• john=141
• ...

and task find occurences of john=14.
came following regular expression: .*=[^14].*\n matches every string without leading 1 after equal sign.
however, want match john=14 in example (and permutations of example). doesn't matter if there 1 or more john=14. thought negation of regular expression, such want find every string isn't equal 1 want find had problem regular expression ([^\bjohn\b=14]\n).

any appreciated :)!

you need use negative lookahead.

^(?!john=14$).* 

negative lookahead @ start asserts string going matched won't contain exact john=14 string. if yes match chars.

or

^(?!.*=14$).*