YAML Definition - Sublime Text

YAML-Improved.sublime-syntax

%YAML 1.2
---
name: YAML (Improved)
file_extensions:
  - yml
  - yaml
scope: source.yaml

contexts:
  main:
    # Comments (line-start or inline)
    - match: '#.*$'
      scope: comment.line.number-sign.yaml

    # Boolean & null constants (only when the value is exactly the boolean)
    - match: ':\s*(true|false|null|yes|no|on|off)\s*$'
      scope: constant.language.boolean.yaml

    # Numbers (int, float, hex, scientific)
    - match: '\b(0[xX][0-9A-Fa-f]+|\d+(\.\d+)?([eE][+-]?\d+)?)\b'
      scope: constant.numeric.yaml

    # Document start/end markers
    - match: '([-]{3}|[.]{3})'
      scope: punctuation.definition.document.yaml

    # Anchors (&foo) and aliases (*foo)
    - match: '(&\w+)'
      scope: entity.name.anchor.yaml
    - match: '(\*\w+)'
      scope: variable.other.alias.yaml

    # Keys
    - match: '(\w+):'
      captures:
        1: entity.name.tag.yaml

    # Include scalars (quoted strings etc.)
    - include: scalars

    # Embedded shell blocks
    - match: '^\s*(script|command|run):\s*\|'
      push:
        - meta_scope: source.yaml.embedded.bash
        - include: scope:source.shell
        - match: '^(?=\S)'
          pop: true

  scalars:
    - match: |
        "([^"\\]|\\.)*"
      scope: string.quoted.double.yaml

    - match: |
        '([^'\\]|\\.)*'
      scope: string.quoted.single.yaml

A much better syntax highlighter for SBT yaml files

Edit needed to differentiate text from comments