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trimprefix(str, prefix) returns str with the leading prefix removed. If str does not start with prefix, it is returned unchanged.

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Signature

trimprefix(str string, prefix string) string

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Example

Strip the v prefix from a git tag to get the bare version number for use in artifact names and package manifests: 
variable "tag" {
  description = "Git release tag (e.g. v1.4.2)"
  type        = string
}

computed "version" {
  description = "Bare version number without the v prefix"
  expression  = trimprefix(var.tag, "v")
}

task "package" {
  description = "Build release archives with the bare version"
  commands = [
    "go build -ldflags \"-X main.version=${computed.version}\" -o bin/app ./cmd/app",
    "tar -czf myapp-${computed.version}-linux-amd64.tar.gz bin/app",
  ]
}
v1.4.2 becomes 1.4.2.

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Notes

  • Only the first occurrence is removed (i.e., if str starts with the prefix exactly once).
  • trimprefix removes a literal string match, not individual characters. Use trim for character-set stripping.