a comma left before a closing bracket
Matches a comma left before a closing bracket. It finds the match anywhere inside the text. There is 1 capture group.
Pattern
/,\s*([}\]])/- Match scope
- anywhere inside the text
- Capture groups
- 1
- What it catches in the first example
- ,]
Try it yourself
Type any text and the parts this expression catches are highlighted. It runs in your browser and is never sent anywhere.
[1,2,]
{"a":1, }
2 matches
Examples that match
- [1,2,]
- {"a":1, }
Examples that do not match
- [1,2]
- {"a":1}
Other expressions in this group
^\s*(\S+)the first word(\S+)\s*$the last word\d+runs of digits inside a text\b\w+\beach word, one by one\[([^\]]*)\]what sits inside square brackets\(([^)]*)\)what sits inside round brackets[\uD800-\uDBFF][\uDC00-\uDFFF]an emoji that takes two code units(.)\1{2,}the same character three times or moreHow 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 comma left before a closing bracket?
,\s*([}\]]).
Q. Which strings match?
Text like [1,2,] matches; text like [1,2] 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 is one capture group, so you can read them from match[1] onwards.