~~~ Option 1 ~~~

    ---
    # Adding a character to the user's flair when they post
    type: submission
    is_edited: false
    author:
      set_flair:
        text: "{{author_flair_text}}I"
        template_id: "{{author_flair_template_id}}"
      overwrite_flair: true
    ---

You can also do it with levels:

    ---
    # Adding a character to the user's flair when they post
    type: submission
    is_edited: false
    author:
      ~flair_text (includes-word): ["Beginner IIIII", "Intermediate IIIII", "Advanced IIIII"]
      set_flair:
        text: "{{author_flair_text}}I"
        template_id: "{{author_flair_template_id}}"
      overwrite_flair: true
    ---
    # Changing "Beginner IIIII" to "Intermediate I"
    type: submission
    is_edited: false
    author:
      flair_text (includes-word): ["Beginner IIIII"]
      set_flair:
        text: "Intermediate I"
        template_id: "{{author_flair_template_id}}"
      overwrite_flair: true
    ---
    # Changing "Intermediate IIIII" to "Advanced I"
    type: submission
    is_edited: false
    author:
      flair_text (includes-word): ["Intermediate IIIII"]
      set_flair:
        text: "Advanced I"
        template_id: "{{author_flair_template_id}}"
      overwrite_flair: true
    ---



~~~ Option 2 ~~~

With each additional rule you need to increase the numbers in the priority/flair_text/text lines

    ---
    # Detect 1st new post by a user
    priority: 0 # run this rule after the other rules because otherwise when this rule finishes then the next rule will detect the changed flair and act on it even though it's the same post
    type: submission
    is_edited: false
    author:
      ~flair_text (full-text, regex): '\d+'
      set_flair:
        template_id: "the id of the flair you want to give"
        text: "1"
      overwrite_flair: true
    ---
    # Detect 2nd post by a user
    priority: 1 # run this before the previous rule
    type: submission
    is_edited: false
    author:
      flair_text (full-text): "1"
      set_flair:
        template_id: "the id of the flair you want to give" # can also use {{author_flair_template_id}} to refer to the existing one
        text: "2"
      overwrite_flair: true
    ---
    # Detect 3rd post by a user
    priority: 2 # run this before the previous rule
    type: submission
    is_edited: false
    author:
      flair_text (full-text): "2"
      set_flair:
        template_id: "the id of the flair you want to give"
        text: "3"
      overwrite_flair: true
    ---



~~~ Option 3 ~~~

With each additional rule you need to increase the numbers in the priority/flair_text/text lines

    ---
    # Detect 1st new post by a user
    priority: 0 # run this rule after the other rules because otherwise when this rule finishes then the next rule will detect the changed flair and act on it even though it's the same post
    type: submission
    is_edited: false
    author:
      ~flair_text (ends-with, regex): '\(\d+\)'
      set_flair:
        template_id: "the id of the flair you want to give"
        text: "Beginner (1)"
      overwrite_flair: true
    ---
    # Detect 2nd post by a user
    priority: 1 # run this before the previous rule
    type: submission
    is_edited: false
    author:
      flair_text (ends-with): "(1)"
      set_flair:
        template_id: "the id of the flair you want to give" # you can also use {{author_flair_template_id}} to refer to the existing one
        text: "Beginner (2)"
      overwrite_flair: true
    ---
    # Detect 3rd post by a user
    priority: 2 # run this before the previous rule
    type: submission
    is_edited: false
    author:
      flair_text (ends-with): "(2)"
      set_flair:
        template_id: "the id of the flair you want to give"
        text: "Beginner (3)"
      overwrite_flair: true
    ---



~~~ Option 4 ~~~

Note that the flair will not have a design because it's not possible to specify template_id because it overrides the specified css_class)

With each additional rule you need to increase the numbers in the priority/flair_text/text lines

    ---
    # Detect 1st new post by a user
    priority: 0 # run this rule after the other rules because otherwise when this rule finishes then the next rule will detect the changed flair and act on it even though it's the same post
    type: submission
    is_edited: false
    author:
      ~flair_css_class (full-text, regex): '\d+'
      set_flair: ["Beginner", "1"]
      overwrite_flair: true
    ---
    # Detect 2nd post by a user
    priority: 1 # run this before the previous rule
    type: submission
    is_edited: false
    author:
      flair_css_class (full-text): "1"
      set_flair: ["Beginner", "2"]
      overwrite_flair: true
    ---
    # Detect 3rd post by a user
    priority: 2 # run this before the previous rule
    type: submission
    is_edited: false
    author:
      flair_css_class (full-text): "2"
      set_flair: ["Beginner", "3"]
      overwrite_flair: true
    ---