VBScript InStrRev Function

Complete VBScript Reference

The InStrRev function returns the position of the first occurrence of one string within another. The search begins from the end of string, but the position returned counts from the beginning of the string.

The InStrRev function can return the following values:

• If string1 is "" - InStrRev returns 0
• If string1 is Null - InStrRev returns Null
• If string2 is "" - InStrRev returns start
• If string2 is Null - InStrRev returns Null
• If string2 is not found - InStrRev returns 0
• If string2 is found within string1 - InStrRev returns the position at which match is found
• If start > Len(string1) - InStrRev returns 0

Tip: Also look at the InStr function

Syntax

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

Example 1

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

Output:

2

Example 2

dim txt,pos
txt="This is a beautiful day!"
'textual comparison
pos=InStrRev(txt,"B",-1,1)
document.write(pos)

Output:

11

Example 3

dim txt,pos
txt="This is a beautiful day!"
'binary comparison
pos=InStrRev(txt,"T")
document.write(pos)

Output:

1

Example 4

dim txt,pos
txt="This is a beautiful day!"
'binary comparison
pos=InStrRev(txt,"t")
document.write(pos)

Output:

15

Complete VBScript Reference

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