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.gitignore

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+node_modules
+package-lock.json

README.md

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+# Branch name normalizer
+
+Simple action that normalizez the current branch name into a string with only lowercase alphanumerical values, separated by hiphens.
+Example: For the branch name: Alex/A-Simple-pr. Output: `alex-a-simple-pr`
+
+Inputs:
+
+- **branch_name**:
+    - default: `$GITHUB_HEAD_REF`
+    - required: `false`
+- **max_length**:
+    - default: `40`
+    - required: `false`
+
+Output:
+
+- **normalized**

action.yml

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+name: "Normalize branch name"
+description: "Normalizes the branch into an "
+inputs:
+  branch:
+    description: "Branch name to normalize. Defaults to $GITHUB_HEAD_REF"
+    required: false
+  max_length:
+    description: "Max length of the branch name. If exceeds, string will be striped down to first max_length chars. Defaults to 40 chars"
+    required: false
+outputs:
+  normalized:
+    description: "Normalized branch name"
+runs:
+  using: "node12"
+  main: "index.js"
+branding:
+  icon: 'terminal'
+  color: 'green'

index.js

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+const core = require("@actions/core");
+const defaultMaxLength = 40
+try {
+    const input = core.getInput("branch") ? core.getInput("branch") : process.env.GITHUB_HEAD_REF;
+    const maxBranchLength = core.getInput("max_length") ? core.getInput("max_length") : defaultMaxLength;
+    let output = input
+        .trim()
+        .toLowerCase()
+        .replace(/([^0-9a-zA-Z-]+)/g, "-");
+    if (output.length > maxBranchLength) {
+        output = output.substring(0, maxBranchLength);
+    }
+    core.setOutput("normalized", output);
+    if (output.charAt(output.length - 1) == '-') {
+        output = output.substring(0, output.length - 1);
+    }
+} catch (err) {
+    core.setFailed(err);
+}

package.json

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+{
+  "name": "branch-name-normalizer",
+  "version": "1.0.0",
+  "description": "Simple action that normalizez the current branch name into a string with only lowercase alphanumerical values, separated by hiphens. Example: For the branch name: Alex/A-Simple-pr. Output: `alex-a-simple-pr`",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@actions/core": "^1.2.7"
+  }
+}