vbs字符串处理

<%
'*************************************************
'函数名：gotTopic
'作 用：截字符串，汉字一个算两个字符，英文算一个字符
'参 数：str ----原字符串
' strlen ----截取长度
'返回值：截取后的字符串
'*************************************************
function gotTopic(str,strlen)
if str="" then
gotTopic=""
exit function
end if
dim l,t,c, i
str=replace(replace(replace(replace(str,"&nbsp;"," "),"&quot;",chr(34)),"&gt;",">"),"&lt;","<")
l=len(str)
t=0
for i=1 to l
c=Abs(Asc(Mid(str,i,1)))
if c>255 then
t=t+2
else
t=t+1
end if
if t>=strlen then
gotTopic=left(str,i) & "…"
exit for
else
gotTopic=str
end if
next
gotTopic=replace(replace(replace(replace(gotTopic," ","&nbsp;"),chr(34),"&quot;"),">","&gt;"),"<","&lt;")
end function

'********************************************
'函数名：IsValidEmail
'作 用：检查Email地址合法性
'参 数：email ----要检查的Email地址
'返回值：True ----Email地址合法
' False ----Email地址不合法
'********************************************
function IsValidEmail(email)
dim names, name, i, c
IsValidEmail = true
names = Split(email, "@")
if UBound(names) <> 1 then
IsValidEmail = false
exit function
end if
for each name in names
if Len(name) <= 0 then
IsValidEmail = false
exit function
end if
for i = 1 to Len(name)
c = Lcase(Mid(name, i, 1))
if InStr("abcdefghijklmnopqrstuvwxyz_-.", c) <= 0 and not IsNumeric(c) then
IsValidEmail = false
exit function
end if
next
if Left(name, 1) = "." or Right(name, 1) = "." then
IsValidEmail = false
exit function
end if
next
if InStr(names(1), ".") <= 0 then
IsValidEmail = false
exit function
end if
i = Len(names(1)) - InStrRev(names(1), ".")
if i <> 2 and i <> 3 then
IsValidEmail = false
exit function
end if
if InStr(email, "..") > 0 then
IsValidEmail = false
end if
end function

'***************************************************
'函数名：IsObjInstalled
'作 用：检查组件是否已经安装
'参 数：strClassString ----组件名
'返回值：True ----已经安装
' False ----没有安装
'***************************************************
Function IsObjInstalled(strClassString)
On Error Resume Next
IsObjInstalled = False
Err = 0
Dim xTestObj
Set xTestObj = Server.CreateObject(strClassString)
If 0 = Err Then IsObjInstalled = True
Set xTestObj = Nothing
Err = 0
End Function

'**************************************************
'函数名：strLength
'作 用：求字符串长度。汉字算两个字符，英文算一个字符。
'参 数：str ----要求长度的字符串
'返回值：字符串长度
'**************************************************
function strLength(str)
ON ERROR RESUME NEXT
dim WINNT_CHINESE
WINNT_CHINESE = (len("中国")=2)
if WINNT_CHINESE then
dim l,t,c
dim i
l=len(str)
t=l
for i=1 to l
c=asc(mid(str,i,1))
if c<0 then c=c+65536
if c>255 then
t=t+1
end if
next
strLength=t
else
strLength=len(str)
end if
if err.number<>0 then err.clear
end function

'***************************************************
'函数名：isInteger
Rem 判断数字是否整形
'***************************************************
function isInteger(para)
on error resume next
dim str
dim l,i
if isNUll(para) then
isInteger=false
exit function
end if
str=cstr(para)
if trim(str)="" then
isInteger=false
exit function
end if
l=len(str)
for i=1 to l
if mid(str,i,1)>"9" or mid(str,i,1)<"0" then
isInteger=false
exit function
end if
next
isInteger=true
if err.number<>0 then err.clear
end function

'*******************************************
'函数名：HTMLEncode
Rem 过滤HTML代码
'*******************************************
function HTMLEncode(fString)
if not isnull(fString) then
fString = replace(fString, ">", "&gt;")
fString = replace(fString, "<", "&lt;")
fString = replace(fString, "&#", "<I>&#</I>")
fString = Replace(fString, CHR(32), "<I></I>&nbsp;")
fString = Replace(fString, CHR(9), "&nbsp;")
fString = Replace(fString, CHR(34), "&quot;")
fString = Replace(fString, CHR(39), "&#39;")
fString = Replace(fString, CHR(13), "")
fString = Replace(fString, CHR(10) & CHR(10), "</P><P> ")
fString = Replace(fString, CHR(10), "<br> ")
HTMLEncode = fString
else
HTMLEncode=fstring
end if
end function

'********************************************
'函数名：Createpass
'系统分配随机密码
'********************************************
Function Createpass()'系统分配随机密码
Dim Ran,i,LengthNum
LengthNum=16
Createpass=""
For i=1 To LengthNum
Randomize
Ran = CInt(Rnd * 2)
Randomize
If Ran = 0 Then
Ran = CInt(Rnd * 25) + 97
Createpass =Createpass& UCase(Chr(Ran))
ElseIf Ran = 1 Then
Ran = CInt(Rnd * 9)
Createpass = Createpass & Ran
ElseIf Ran = 2 Then
Ran = CInt(Rnd * 25) + 97
Createpass =Createpass& Chr(Ran)
End If
Next
End Function

'*********************************************
'函数名：Replacehtml
'去掉HTML标记
'*********************************************
Public Function Replacehtml(Textstr)
Dim Str,re
Str=Textstr
Set re=new RegExp
re.IgnoreCase =True
re.Global=True
re.Pattern="<(.[^>]*)>"
Str=re.Replace(Str, "")
Set Re=Nothing
Replacehtml=Str
End Function

'*********************************************
'函数名：cutStr
'截取指定字符
'*********************************************
Function cutStr(str,strlen)
'去掉所有HTML标记
Dim re
Set re=new RegExp
re.IgnoreCase =True
re.Global=True
re.Pattern="<(.[^>]*)>"
str=re.Replace(str,"")
set re=Nothing
Dim l,t,c,i
l=Len(str)
t=0
For i=1 to l
c=Abs(Asc(Mid(str,i,1)))
If c>255 Then
t=t+2
Else
t=t+1
End If
If t>=strlen Then
cutStr=left(str,i)&"..."
Exit For
Else
cutStr=str
End If
Next
str = dvHTMLEncode(str)
cutStr=Replace(cutStr,chr(10),"")
End Function

'*****************************************
‘剔除一个双引号"
key=replace(key,"""","")
------------
‘用 | 替换一个空格
key=replace(key," ","|")
-----------
‘两个空格替换为一个空格
'多个空格不能正常显示，只显示一个空格；但是字符串操作是正常的，该是几个就是几个。
key=replace(key," "," ")
-----------
'用 | 替换字符串中的一个空格和多个连续空格
do while instr(key," ")<>0
key=replace(key," "," ")
loop
key=replace(key," ","|")
-----------
%>
******************************************************
******************************************************
<%
function URLDecode(enStr)
dim deStr,strSpecial
dim c,i,v
deStr=""
strSpecial="!""#$%&'()*+,/:;<=>?@[/]^`{ |}~%"
for i=1 to len(enStr)
c=Mid(enStr,i,1)
if c="%" then
v=eval("&h"+Mid(enStr,i+1,2))
if inStr(strSpecial,chr(v))>0 then
deStr=deStr&chr(v)
i=i+2
else
v=eval("&h"+Mid(enStr,i+1,2)+Mid(enStr,i+4,2))
deStr=deStr&chr(v)
i=i+5
end if
else
if c="+" then
deStr=deStr&" "
else
deStr=deStr&c
end if
end if
next
URLDecode=deStr
end function
%>
－－－－－－－－－－－－－－－－－－－－－
<%
function U8Decode(enStr)
'输入一堆有%分隔的字符串，先分成数组，根据utf8规则来判断补齐规则
'输入:关 E5 85 B3 键 E9 94 AE 字 E5 AD 97
'输出:关 B9D8 键 BCFC 字 D7D6
dim c,i,i2,v,deStr,WeiS

for i=1 to len(enStr)
c=Mid(enStr,i,1)
if c="%" then
v=c16to2(Mid(enStr,i+1,2))
'判断第一次出现0的位置，
'可能是1(单字节)，3(3-1字节)，4，5，6，7不可能是2和大于7
'理论上到7，实际不会超过3。
WeiS=instr(v,"0")
v=right(v,len(v)-WeiS)'第一个去掉最左边的WeiS个
i=i+3
for i2=2 to WeiS-1
c=c16to2(Mid(enStr,i+1,2))
c=right(c,len(c)-2)'其余去掉最左边的两个
v=v & c
i=i+3
next
if len(c2to16(v)) =4 then
deStr=deStr & chrw(c2to10(v))
else
deStr=deStr & chr(c2to10(v))
end if
i=i-1
else
if c="+" then
deStr=deStr&" "
else
deStr=deStr&c
end if
end if
next
U8Decode = deStr
end function

function c16to2(x)
'这个函数是用来转换16进制到2进制的，可以是任何长度的，一般转换UTF-8的时候是两个长度，比如A9
'比如：输入“C2”，转化成“11000010”,其中1100是"c"是10进制的12（1100），那么2（10）不足4位要补齐成（0010）。
dim tempstr
dim i:i=0'临时的指针

for i=1 to len(trim(x))
tempstr= c10to2(cint(int("&h" & mid(x,i,1))))
do while len(tempstr)<4
tempstr="0" & tempstr'如果不足4位那么补齐4位数
loop
c16to2=c16to2 & tempstr
next
end function

function c2to16(x)
'2进制到16进制的转换，每4个0或1转换成一个16进制字母，输入长度当然不可能不是4的倍数了

dim i:i=1'临时的指针
for i=1 to len(x) step 4
c2to16=c2to16 & hex(c2to10(mid(x,i,4)))
next
end function

function c2to10(x)
'单纯的2进制到10进制的转换，不考虑转16进制所需要的4位前零补齐。
'因为这个函数很有用！以后也会用到，做过通讯和硬件的人应该知道。
'这里用字符串代表二进制
c2to10=0
if x="0" then exit function'如果是0的话直接得0就完事
dim i:i=0'临时的指针
for i= 0 to len(x) -1'否则利用8421码计算，这个从我最开始学计算机的时候就会，好怀念当初教我们的谢道建老先生啊！
if mid(x,len(x)-i,1)="1" then c2to10=c2to10+2^(i)
next
end function

function c10to2(x)
'10进制到2进制的转换
dim sign, result
result = ""
'符号
sign = sgn(x)
x = abs(x)
if x = 0 then
c10to2 = 0
exit function
end if
do until x = "0"
result = result & (x mod 2)
x = x / 2
loop
result = strReverse(result)
if sign = -1 then
c10to2 = "-" & result
else
c10to2 = result
end if
end function
%>
*************************************************************
*************************************************************
<%
'汉字gb2312转换为UTF-8编码：

function chinese2unicode(Str)
dim i
dim Str_one
dim Str_unicode
for i=1 to len(Str)
Str_one=Mid(Str,i,1)
Str_unicode=Str_unicode&chr(38)
Str_unicode=Str_unicode&chr(35)
Str_unicode=Str_unicode&chr(120)
Str_unicode=Str_unicode& Hex(ascw(Str_one))
Str_unicode=Str_unicode&chr(59)
next
Response.Write Str_unicode
end function

'UTF-8 转换为 GB2312：

function UTF2GB(UTFStr)
for Dig=1 to len(UTFStr)
if mid(UTFStr,Dig,1)="%" then
if len(UTFStr) >= Dig+8 then
GBStr=GBStr & ConvChinese(mid(UTFStr,Dig,9))
Dig=Dig+8
else
GBStr=GBStr & mid(UTFStr,Dig,1)
end if
else
GBStr=GBStr & mid(UTFStr,Dig,1)
end if
next
UTF2GB=GBStr
end function

function ConvChinese(x)
A=split(mid(x,2),"%")
i=0
j=0

for i=0 to ubound(A)
A(i)=c16to2(A(i))
next

for i=0 to ubound(A)-1
DigS=instr(A(i),"0")
Unicode=""
for j=1 to DigS-1
if j=1 then
A(i)=right(A(i),len(A(i))-DigS)
Unicode=Unicode & A(i)
else
i=i+1
A(i)=right(A(i),len(A(i))-2)
Unicode=Unicode & A(i)
end if
next

if len(c2to16(Unicode))=4 then
ConvChinese=ConvChinese & chrw(int("&H" & c2to16(Unicode)))
else
ConvChinese=ConvChinese & chr(int("&H" & c2to16(Unicode)))
end if
next
end function

function c2to16(x)
i=1
for i=1 to len(x) step 4
c2to16=c2to16 & hex(c2to10(mid(x,i,4)))
next
end function

function c2to10(x)
c2to10=0
if x="0" then exit function
i=0
for i= 0 to len(x) -1
if mid(x,len(x)-i,1)="1" then c2to10=c2to10+2^(i)
next
end function

function c16to2(x)
i=0
for i=1 to len(trim(x))
tempstr= c10to2(cint(int("&h" & mid(x,i,1))))
do while len(tempstr)<4
tempstr="0" & tempstr
loop
c16to2=c16to2 & tempstr
next
end function

function c10to2(x)
mysign=sgn(x)
x=abs(x)
DigS=1
do
if x<2^DigS then
exit do
else
DigS=DigS+1
end if
loop
tempnum=x

i=0
for i=DigS to 1 step-1
if tempnum>=2^(i-1) then
tempnum=tempnum-2^(i-1)
c10to2=c10to2 & "1"
else
c10to2=c10to2 & "0"
end if
next
if mysign=-1 then c10to2="-" & c10to2
end function
%>