package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)\[([^]]*)\]`)
var str = `[EtlRowId]
,[PartitionKey]
,[RowKey]
,[Timestamp]
,[LoadDTS]
,[Microsoft_VSTS_Common_BacklogPriority]
,[Microsoft_VSTS_Common_Priority]
,[Microsoft_VSTS_Common_ValueArea]
,[Microsoft_VSTS_Scheduling_Effort]
,[System_AreaPath]
,[System_BoardColumn]
,[System_BoardColumnDone]
,[System_ChangedBy]
,[System_ChangedDate]
,[System_CommentCount]
,[System_CreatedBy]
,[System_CreatedDate]
,[System_IterationPath]
,[System_Reason]
,[System_State]
,[System_Tags]
,[System_TeamProject]
,[System_Title]
,[System_WorkItemType]
,[TeamNowCustomerId]
,[fields]
,[id]
,[projectId]
,[projectName]
,[rev]
,[url]
,[Microsoft_VSTS_Common_ClosedDate]
,[System_AssignedTo]
,[BugIterationHash]
,[TeamIterationHash]
,[BugHash]`
var substitution = "MAX(LEN([${1}])) AS [${1}]"
fmt.Println(re.ReplaceAllString(str, substitution))
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Golang, please visit: https://golang.org/pkg/regexp/