Fix Terraform Error: Invalid Escape Sequence in String

# ❌ Single backslash — invalid
path = "C:\Users\admin\scripts"
 
# ✅ Double backslash
path = "C:\\Users\\admin\\scripts"
 
# ✅ Or use forward slashes (works on Windows too)
path = "C:/Users/admin/scripts"

Error: Invalid escape sequence
 
  on main.tf line 5, in locals:
   5:   path = "C:\Users\admin"
 
The symbol "U" is not a valid escape sequence selector.

locals {
  # Windows paths
  script_path  = "C:\\Users\\admin\\scripts\\deploy.ps1"
  share_path   = "\\\\server\\share\\folder"
}

locals {
  script_path = "C:/Users/admin/scripts/deploy.ps1"
}
 
provisioner "local-exec" {
  command = "powershell -File C:/Users/admin/scripts/deploy.ps1"
}

locals {
  # Heredoc — no escape processing
  script = <<-EOT
    $path = "C:\Users\admin\scripts"
    Get-ChildItem $path | ForEach-Object { $_.Name }
  EOT
}

locals {
  raw_script = <<-'EOT'
    No interpolation: ${this.is.literal}
    Backslashes work: C:\Users\admin
  EOT
}

# ❌ Invalid
locals {
  pattern = regex("\\d+\\.\\d+", var.version)
}
 
# ✅ Double-escape: \\ for HCL → \ for regex
locals {
  # Match digits.digits (e.g., "5.60")
  pattern = regex("\\d+\\.\\d+", var.version)
}

# template.ps1
$path = "C:\Users\admin"
Get-Process | Where-Object { $_.CPU -gt 100 }
 
# main.tf — templatefile reads the file as-is (no HCL escaping)
locals {
  script = templatefile("${path.module}/template.ps1", {
    admin_user = var.admin_user
  })
}