Illustrative structure. The walk visits every term and connector in drawing order; no input is matched or parsed.

0 / 13000 ms
Structural exploration

Paused

Identifier Railroad diagram of the regular expression ^[A-Za-z_][A-Za-z0-9_]{0,31}$ with 4 terms. It shows structure; it does not match input. Identifier {0,31} ^ line start one of A-Z a-z _ one of A-Z a-z 0-9 _ $ line end pattern