ColdFusion和尾隨逗號

Question

如何從ColdFusion中的字符串中刪除尾隨逗號？

Answer 1

要刪除尾隨逗號（如果它存在）：

REReplace(list, ",$", "") 

要去除的一個或多個拖尾逗號：

REReplace(list, ",+$", "") 

Answer 2

檢查最右邊的char - 如果是逗號，則將字符串設置爲原始的子串，長度爲-1。

修整字符串可確保尾隨逗號後的空格不會干擾此方法。

<cfset myStr = "hello, goodbye,"> 
<cfset myStr = trim(myStr)> 

<cfif right(myStr, 1) is ","> 
    <cfset myStr = left(myStr, len(myStr)-1)> 
</cfif> 

Answer 3

要添加到帕特里克答案。爲了在年底更換一個或多個逗號使用以下命令： reReplace（MyString的， 「+ $」， 「」， 「全」）

例子下面

<cfset myString = "This is the string, with training commas,,,"> 
<cfset onlyTheLastTrailingComma = reReplace(myString, ",$", "", "all")> 
<cfset allTrailingCommas = reReplace(myString, ",+$", "", "all")> 
<cfoutput>#onlyTheLastTrailingComma#<br />#allTrailingCommas#</cfoutput> 

Answer 4

這可能是更多的性能比Regex的列表要好，但有時當我最終過濾/修復髒數據時，我將它轉換爲數組，然後將其轉換回列表。

<cfset someVariable = arrayToList(listToArray(someVariable, ","), ",")> 

它的欺騙，但它工作;-)

Answer 5

也容易：

<cfset CleanList = ListChangeDelims(DirtyList, ",", ",")> 

解釋：這需要一個事實，即CF名單函數忽略空元素的優勢。 ListChangeDelims()因此剝離最後一個「元素」。

Answer 6

雙方，只要在右側，或者只是左側刪除「」

<cfset theFunnyList = ",!@2ed32,a,b,c,d,%442,d,a"> 

更換奇怪的字符，並用逗號分隔

<cfset theList = rereplace(theFunnyList, "[^A-Za-z0-9]+", ",", "all")> 
<cfset theList = trim(theList)> 
<cfif left(theList, 1) is "," and right(theList, 1) is ","> 
    <cfset theList = right(theList, len(theList)-1)> 
    <cfset theList = left(theList, len(theList)-1)> 
<cfelseif right(theList, 1) is ","> 
    <cfset theList = left(theList, len(theList)-1)> 
<cfelseif left(theList, 1) is ","> 
    <cfset theList = right(theList, len(theList)-1)> 
</cfif> 

排序列表（數字到AZ） ASCending

<cfoutput> #ListSort("#theList#", "text", "ASC", ",;")# </cfoutput>