Bash Brace Expansion Visualizer

Type a bash brace pattern and see exactly what the shell would expand it to — without running anything. Supports comma lists {a,b,c}, numeric ranges {1..10}, character ranges {a..z}, ranges with steps {0..20..2}, zero padding {001..010}, and arbitrary nesting {a,b{1..3},c}.

Notes

This implements the GNU bash brace-expansion grammar — it does not perform globbing, parameter expansion, or word splitting.
Adjacent groups produce a Cartesian product: {a,b}{1,2} → a1 a2 b1 b2.
Numeric ranges respect zero-padding when either endpoint is padded: {01..05} → 01 02 03 04 05.
Character ranges work on single ASCII letters: {a..f} → a b c d e f. They go in either direction.
An optional step can reverse direction: {10..1..2} → 10 8 6 4 2.
If a brace group can't be parsed (single element, no .., no comma), it is left intact like bash does.
To prevent runaway expansion, output is capped at 100,000 entries.

Bash Brace Expansion

Examples

Notes