i try to add before every word that do not have a starting [string]: to have Line: at its start so i did this regex ^(?![^:]+:) https://regex101.com/r/oMF8ks/1
and if i write
1
2
3
it returns what i want expected
Line:1
Line:2
Line:3
and for
Line:1
Line:2
Line:3
it returns same as wanted
but my problem when i try to apply it on https://regex101.com/r/K0z3bc/1
1 : A
2 : B
3 : C
i expected
Line:1 : A
Line:2 : B
Line:3 : C
but i only got
1 : A
2 : B
3 : C
but when i change the regex to ^(?!Line:) https://regex101.com/r/49i9tQ/1 then it works but i want it to work for all words and not just Line
You can use
^([^:\s]++)(?!:)
and replace with Line:$1.
See the regex demo. Details:
^ - start of string([^:\s]++) - Group 1: one or more chars other than : and whitespace (possessive quantifier prevents backtracking into the [^:\s] pattern and thus prevents partial matching if a colon is present further in the string)(?!:) - not immediately followed with a colon.You may also omit the group and then use ^[^:\s]++(?!:) and replace with Line:$0. See this regex demo.