Find any line that starts with this and doesn't contain that

Question

How do I find any string that starts with abc and doesn't have the word test anywhere in the rest of the string?

abc blah test (no match)
abc blah blah test (no match)
abc blah (match)

I found the following but I don't know how to put in the abc part.

^(?!.*Test).*$

Credit: https://stackoverflow.com/a/1318314/139698

You can use `(?i)^abc(?!.*\bTest\b).*$` https://regex101.com/r/Y7zhR9/1 — The fourth bird, Apr 07 '21 at 00:23
`var result = words.Where(word => word.StartsWith("abc") && word.Contains("test")).ToList();` — Rufus L, Apr 07 '21 at 00:29
Wouldn't you just put `abc` after the start character (`'^'`)? — Rufus L, Apr 07 '21 at 00:31
@RufusL `.Contains()` might be a good idea. I just want to point out that it won't work if the OP wants to reject "test" but not "testing", which is likely the case here. — 41686d6564 stands w. Palestine, Apr 07 '21 at 00:35
@Thefourthbird thanks, if you write that as an answer I will mark it. — Rod, Apr 07 '21 at 00:48

score 1 · Accepted Answer · answered Apr 07 '21 at 14:46

You can make the match case insensitive using for example an inline modifier (?i) and use word boundaries \b around test and after abc to prevent partial matches.

Match abc first, and use the assertion afterwards.

(?i)^abc\b(?!.*\bTest\b).*$

.Net regex demo

Find any line that starts with this and doesn't contain that

1 Answers1