Tab-separated: trigger replacement flags description
Flags: auto = expand on type, math/text = mode restriction. Use $1, $2 for tabstops.

Standard UltiSnips format. Use snippet trigger "desc" options ... endsnippet.
Options: b = line start, i = in-word, w = word boundary, A = auto, r = regex.
Tabstops: $1, ${1:default}. Python: `!p snip.rv = ...`