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VBScript InStrRev function

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InStrRev function returns the position of the first occurrence of a string in another string. Start searching from the end of the string, but the return position from the beginning of the string counted.

InStrRev function can return the following values:

  • If string1 is "" - InStrRev returns 0
  • If string1 is Null - Null InStrRev return
  • If string2 is "" - InStrRev return to start
  • If string2 is Null - Null InStrRev return
  • If string2 is not found - InStrRev returns 0
  • If string2 is found within string1 in - InStrRev return to find the matching string location
  • If start> Len (string1) - InStrRev returns 0

Tip: See the InStr function.

grammar

InStrRev(string1,string2[,start[,compare]])

参数 描述
string1 必需。需要被搜索的字符串。
string2 必需。需要搜索的字符串表达式。
start 可选。规定每次搜索的起始位置。默认的搜索起始位置是最后一个字符（-1）。
compare 可选。规定要使用的字符串比较类型。默认是 0。

可采用下列的值：

  • 0 = vbBinaryCompare - 执行二进制比较
  • 1 = vbTextCompare - 执行文本比较

Examples

Example 1

<script type="text/vbscript">

txt="This is a beautiful day!"
document.write(InStrRev(txt,"beautiful"))

</script>

Examples of the above output:

11

try it"

Example 2

Find the letter "i", with different start position:

<script type="text/vbscript">

txt="This is a beautiful day!"
document.write(InStrRev(txt,"i",-1) & "<br />")
document.write(InStrRev(txt,"i",7) & "<br />")

</script>

Examples of the above output:

16
6

try it"

Example 3

Find the letter "T", using both text and binary comparison:

<script type="text/vbscript">

txt="This is a beautiful day!"
document.write(InStrRev(txt,"T",-1,1) & "<br />")
document.write(InStrRev(txt,"T",-1,0) & "<br />")

</script>

Examples of the above output:

15
1

try it"
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