Octals - language feature

Example from Java, AspectJ, Pizza, Oracle Java, Deesel:

// 0[0-7_]+[lL]?

// 0[oO]?[0-7]+n?
0o464063622

Example from Python:

# 0[oO](?:_?[0-7])+

Example from Perl:

# 0_?[0-7]+(_[0-7]+)*

Example from Go:

// 0[0-7]+

Example from Swift:

// 0o[0-7_]+

Example from Haskell:

-- 0[oO]_*[0-7](_*[0-7])*

Example from Julia:

# 0o[0-7]+((_[0-7]+)+)?

Example from Prolog, CLPR, GAEA, Progol:

% 0o[0-7]+

Example from Elixir:

# 0o[0-7]+

Example from Verilog:

// ([0-9]+)|(\'o)[0-7]+

Example from Reason:

// 0[oO][0-7][0-7_]*

Example from F#:

// 0[oO][0-7][0-7_]*[uU]?[yslLn]?

Example from Eiffel:

-- 0[cC][0-7]+

Example from D:

// 0[0-7_]+

Example from VHDL:

-- O"[0-7_]+"

Example from PostScript:

% [0-9]+\#(\-|\+)?([0-9]+\.?|[0-9]*\.[0-9]+|[0-9]+\.[0-9]*)((e|E)[0-9]+)?(?=[()<>\[\]{}/%\s])

Example from Chapel:

// 0[oO][0-7]+

Example from Protocol Buffers:

// 0[0-7]+[LlUu]*

Example from AutoIt, AutoHotkey:

; 0\d+

Example from Hy:

; 0[0-7]+j?

Example from Boo:

# 0\d+

Example from SystemVerilog:

// ([1-9][_0-9]*)?\s*\'[sS]?[oO]\s*[xXzZ?0-7][_xXzZ?0-7]*

Example from C3:

0o177

Example from Golo:

# 0[0-7]+j?

Example from Felix:

// 0[0-7_]+([tTsSiIlLvV]|ll|LL|([iIuU])(8|16|32|64))?

Example from Jule:

0455

Languages with Octals include Java, JavaScript, Python, Perl, Go, Swift, Haskell, TypeScript, Julia, Prolog, Elixir, Verilog, Reason, F#, Eiffel, OCaml, D, VHDL, PostScript, Chapel, Protocol Buffers, Coq, Zig, AutoIt, Hy, Opa, IDL, Boo, F*, SystemVerilog, Cython, Isabelle, C3, Puppet, AutoHotkey, AspectJ, Golo, SourcePawn, HLSL, GLSL, Felix, Jule, Pizza, Cryptol, ooc, Meson, Logtalk, Earl Grey, Pawn, FloScript, CLPR, nimrod, CBOR data definition language, Oracle Java, Deesel, GAEA, Progol

Languages without Octals include Speedie, progsbase

This question asks: Does the language have a syntax for octal numbers?