a hex colour inside running text
Matches a hex colour inside running text. It finds the match anywhere inside the text. There are no capture groups.
Pattern
/#[0-9a-fA-F]{6}\b/- Match scope
- anywhere inside the text
- Capture groups
- 0
- What it catches in the first example
- #ff0000
Try it yourself
Type any text and the parts this expression catches are highlighted. It runs in your browser and is never sent anywhere.
color: #ff0000;
#00FF00 background
2 matches
Examples that match
- color: #ff0000;
- #00FF00 background
Examples that do not match
- #ff00
- no colour
Other expressions in this group
,\s*([}\]])a comma left before a closing bracket\*\*([^*]+)\*\*bold text wrapped in double asterisks`([^`]+)`code wrapped in backticks(\w+)="([^"]*)"an attribute whose value is in double quotes\x1b\[[0-9;]*ma terminal colour escape codefrom ['\"]([^'\"]+)['\"]the path in an import statementTODO:?\s*(.*)a TODO note left in a comment\d+(px|em|rem|%)a number with a CSS unitHow 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 hex colour inside running text?
#[0-9a-fA-F]{6}\b.
Q. Which strings match?
Text like color: #ff0000; matches; text like #ff00 does not.
Q. Does the whole string have to match?
No. It finds the part anywhere inside the text. Add ^ and $ around it if you want a whole-string check.
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.