Application

Inline Icons

{
  "pattern": "(:fire:)()",
  "styles": [
    {
      "styleType": "JSON",
      "preset": "{\"type\": \"object\", \"atlas\": \"minecraft:blocks\", \"sprite\": \"block/campfire_fire\"}"
    }
  ]
}

If you use the JSON type, you can replace the matched string with JSON. The example above shows how to use the JSON type to replace :fire: with a fire atlas.
You can read about Minecraft’s atlas Text component format wiki and Atlas wiki.

Text Formatting & Text Placeholder API

{
  "pattern": "(.+)()",
  "styles": [
    {
      "styleType": "REPLACE",
      "preset": "<b>[%player:displayname%]</b> %embellish-chat:content%"
    }
  ]
}

You can format the chat by matching all rules from the first English styling set and applying them using the REPLACE type. When using custom formatting, ensure that useClearFormat is enabled.

Using chat as a macro

[
  {
    "pattern": "(sad)()",
    "styles": [{ "styleType": "COMMAND_RUN", "preset": "/trigger ec.flag set 100" }]
  },
  {
    "pattern": "(like|love)()",
    "styles": [{ "styleType": "COMMAND_RUN", "preset": "/trigger ec.flag set 200" }]
  },
  {
    "pattern": "(hate)()",
    "styles": [{ "styleType": "COMMAND_RUN", "preset": "/trigger ec.flag set 300" }]
  },
  {
    "pattern": "(oh|ah)()",
    "styles": [{ "styleType": "COMMAND_RUN", "preset": "/trigger ec.flag set 400" }]
  }
]

Triggers and the COMMAND_RUN type allow chat to function as a macro. The example above demonstrates a showcase datapack that enables expressions like crying or joy through chat.

If you want, you can download it here.

Global Style

{
  "pattern": "(.+)()",
  "styles": [
    {
      "styleType": "COLOR_RAINBOW",
      "preset": "0.3"
    }
  ]
}

In regular expressions, .+ means all characters. Using this method, you can apply a subtle rainbow effect to all text.

Using It Directly as an Option

{
  "pattern": "((red))",
  "styles": [
    {
      "styleType": "COLOR_PRESET",
      "preset": ""
    }
  ]
}

If you write it like ((text)), you can make capture group 1 and 2 have the same content in the regular expression. For example, if you put ((red)) in the preset, every red will be displayed in red.