diff --git a/src/staxfile/expressions.ts b/src/staxfile/expressions.ts
index ace4b64..0bb5fc4 100644
--- a/src/staxfile/expressions.ts
+++ b/src/staxfile/expressions.ts
@@ -23,7 +23,7 @@ export default class Expressions {
     if (name === 'user_id') return process.getuid().toString()
     if (name === 'dasherize') return dasherize(args[0])
     if (name === 'exists') return existsSync(args[0]).toString()
-    if (name === 'grep') return this.grep(args[0], args[1]).toString()
+    if (name === 'test') return this.test(args[0], args[1]).toString()
 
     this.staxfile.warnings.add(`Invalid template expression: ${name}`)
   }
@@ -74,7 +74,7 @@ export default class Expressions {
       '${{ stax.host_services }}:/run/host-services'
   }
 
-  private grep(filename: string, pattern: string): boolean {
+  private test(filename: string, pattern: string): boolean {
     const content = this.read(filename, '')
     const regex = new RegExp(pattern)
     return regex.test(content)
diff --git a/tests/unit/staxfile/expressions.test.js b/tests/unit/staxfile/expressions.test.js
index f8cd233..12763d2 100644
--- a/tests/unit/staxfile/expressions.test.js
+++ b/tests/unit/staxfile/expressions.test.js
@@ -76,7 +76,7 @@ describe('Expressions', () => {
     expect(staxfile.warnings).toContain("Undefined reference to 'stax.undefined_key'")
   })
 
-  describe('grep', () => {
+  describe('test', () => {
     let expressions
     let mockStaxfile
 
@@ -96,19 +96,19 @@ describe('Expressions', () => {
 
     it('returns true when pattern is found in file', () => {
       mockStaxfile.location.readSync.mockImplementation(() => 'Hello, world!')
-      const result = expressions.evaluate('grep', ['test.txt', 'world'])
+      const result = expressions.evaluate('test', ['test.txt', 'world'])
       expect(result).toBe('true')
     })
 
     it('returns false when pattern is not found in file', () => {
       mockStaxfile.location.readSync.mockImplementation(() => 'Hello, world!')
-      const result = expressions.evaluate('grep', ['test.txt', 'foo'])
+      const result = expressions.evaluate('test', ['test.txt', 'foo'])
       expect(result).toBe('false')
     })
 
     it('uses default value when file cannot be read', () => {
       mockStaxfile.location.readSync.mockImplementation(() => { throw new Error('File not found') })
-      const result = expressions.evaluate('grep', ['nonexistent.txt', 'pattern'])
+      const result = expressions.evaluate('test', ['nonexistent.txt', 'pattern'])
       expect(result).toBe('false')
     })
   })