a line that does not contain a given word
Matches a line that does not contain a given word. It is anchored at both ends, so the whole string has to match. There are no capture groups.
Pattern
/^(?!.*\btest\b).*$/- Match scope
- the whole string
- Capture groups
- 0
- What it catches in the first example
- production code
Try it yourself
Type any text and the parts this expression catches are highlighted. It runs in your browser and is never sent anywhere.
production code
1 match
Examples that match
- production code
- testing
Examples that do not match
- this is a test
- test
Other expressions in this group
(?<=\$)\d+a number preceded by a certain sign(?<!\$)\b\d+a number without that sign in front^(?=.*[A-Z])(?=.*\d)(?=.*[a-z]).{8,}$eight or more characters with upper, lower and a digit^(?!.* ).+$text with no double space anywhere^(?=.*@).+$text that must contain this sign\B(?=(\d{3})+(?!\d))the spot where a thousands comma goes^(?!.*(.)\1).+$no character repeated back to back(?<=₩)\d+digits that follow a won signHow to read this
- With ^ and $ around it, the whole string must match; without them the match can sit anywhere. Always anchor an expression you use for validation.
- Round brackets ( ) capture what they wrap. When you only need grouping, write (?: ) so the numbering of later groups does not shift.
- Every expression here is checked against its examples. Even so, "looks like an email" and "is a real inbox" remain different questions.
- Nested open-ended repeats such as (a+)+ can blow up on certain inputs. Look for that shape before pasting someone else’s expression into your code.
Frequently asked questions
Q. What is the regex for a line that does not contain a given word?
^(?!.*\btest\b).*$.
Q. Which strings match?
Text like production code matches; text like this is a test does not.
Q. Does the whole string have to match?
Yes. It is wrapped in ^ and $, so nothing but a full match passes.
Q. How do I use what it caught?
There are no capture groups, so only the whole match (match[0]) comes back. Wrap the part you need in brackets to capture it.