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x86 2000-06-28
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看看这个,是不是简单多了,s是字符串的一个方法,用于字符串匹配,匹配的模式是规则表达式,与Perl的类似
<html>
<body>
<script language=javascript>
function isdigit(s)
{
var r,re;
re = /\d*/i; //\d表示数字,*表示匹配多个数字
r = s.match(re);
return (r==s)?1:0;
}
var s1 = "12345";
var s2 = "12345a";
var s3 = "abcd";
alert("s1="+isdigit(s1)+"\nr2="+isdigit(s2)+"\nr3="+isdigit(s3));
</script>
</body>
</html>
下面是一些常用的规则,看不清楚吗,在MSDN中可以找到(在Platform中)
Character Description
\ Marks the next character as special. /n/ matches the character "n". The sequence /\n/ matches a linefeed or newline character.
^ Matches the beginning of input or line.
$ Matches the end of input or line.
* Matches the preceding character zero or more times. /zo*/ matches either "z" or "zoo."
+ Matches the preceding character one or more times. /zo+/ matches "zoo" but not "z."
? Matches the preceding character zero or one time. /a?ve?/ matches the "ve" in "never."
. Matches any single character except a newline character.
(pattern) Matches pattern and remembers the match. The matched substring can be retrieved from the result Array object elements [1]...[n] or the RegExp object's $1...$9 properties. To match parentheses characters ( ), use "\(" or "\)".
x|y Matches either x or y. /z|food?/ matches "zoo" or "food."
{n} n is a nonnegative integer. Matches exactly n times. /o{2}/ does not match the "o" in "Bob," but matches the first two o's in "foooood."
{n,} n is a nonnegative integer. Matches at least n times. /o{2,}/ does not match the "o" in "Bob" and matches all the o's in "foooood." /o{1,}/ is equivalent to /o+/.
{n,m} m and n are nonnegative integers. Matches at least n and at most m times. /o{1,3}/ matches the first three o's in "fooooood."
[xyz] A character set. Matches any one of the enclosed characters. /[abc]/ matches the "a" in "plain."
[^xyz] A negative character set. Matches any character not enclosed. /[^abc]/ matches the "p" in "plain."
\b Matches a word boundary, such as a space. /ea*r\b/ matches the "er" in "never early."
\B Matches a nonword boundary. /ea*r\B/ matches the "ear" in "never early."
\d Matches a digit character. Equivalent to [0-9].
\D Matches a nondigit character. Equivalent to [^0-9].
\f Matches a form-feed character.
\n Matches a linefeed character.
\r Matches a carriage return character.
\s Matches any white space including space, tab, form-feed, and so on. Equivalent to [ \f\n\r\t\v]
\S Matches any nonwhite space character. Equivalent to [^ \f\n\r\t\v]
\t Matches a tab character.
\v Matches a vertical tab character.
\w Matches any word character including underscore. Equivalent to [A-Za-z0-9_].
\W Matches any nonword character. Equivalent to [^A-Za-z0-9_].
\num Matches num, where num is a positive integer. A reference back to remembered matches. \1 matches what is stored in RegExp.$1.
/n/ Matches n, where n is an octal, hexadecimal, or decimal escape value. Allows embedding of ASCII codes into regular expressions.
--------------------------------------------------------------------------------
<html>
<body>
<script language=javascript>
function isdigit(s)
{
var r,re;
re = /\d*/i; //\d表示数字,*表示匹配多个数字
r = s.match(re);
return (r==s)?1:0;
}
var s1 = "12345";
var s2 = "12345a";
var s3 = "abcd";
alert("s1="+isdigit(s1)+"\nr2="+isdigit(s2)+"\nr3="+isdigit(s3));
</script>
</body>
</html>
下面是一些常用的规则,看不清楚吗,在MSDN中可以找到(在Platform中)
Character Description
\ Marks the next character as special. /n/ matches the character "n". The sequence /\n/ matches a linefeed or newline character.
^ Matches the beginning of input or line.
$ Matches the end of input or line.
* Matches the preceding character zero or more times. /zo*/ matches either "z" or "zoo."
+ Matches the preceding character one or more times. /zo+/ matches "zoo" but not "z."
? Matches the preceding character zero or one time. /a?ve?/ matches the "ve" in "never."
. Matches any single character except a newline character.
(pattern) Matches pattern and remembers the match. The matched substring can be retrieved from the result Array object elements [1]...[n] or the RegExp object's $1...$9 properties. To match parentheses characters ( ), use "\(" or "\)".
x|y Matches either x or y. /z|food?/ matches "zoo" or "food."
{n} n is a nonnegative integer. Matches exactly n times. /o{2}/ does not match the "o" in "Bob," but matches the first two o's in "foooood."
{n,} n is a nonnegative integer. Matches at least n times. /o{2,}/ does not match the "o" in "Bob" and matches all the o's in "foooood." /o{1,}/ is equivalent to /o+/.
{n,m} m and n are nonnegative integers. Matches at least n and at most m times. /o{1,3}/ matches the first three o's in "fooooood."
[xyz] A character set. Matches any one of the enclosed characters. /[abc]/ matches the "a" in "plain."
[^xyz] A negative character set. Matches any character not enclosed. /[^abc]/ matches the "p" in "plain."
\b Matches a word boundary, such as a space. /ea*r\b/ matches the "er" in "never early."
\B Matches a nonword boundary. /ea*r\B/ matches the "ear" in "never early."
\d Matches a digit character. Equivalent to [0-9].
\D Matches a nondigit character. Equivalent to [^0-9].
\f Matches a form-feed character.
\n Matches a linefeed character.
\r Matches a carriage return character.
\s Matches any white space including space, tab, form-feed, and so on. Equivalent to [ \f\n\r\t\v]
\S Matches any nonwhite space character. Equivalent to [^ \f\n\r\t\v]
\t Matches a tab character.
\v Matches a vertical tab character.
\w Matches any word character including underscore. Equivalent to [A-Za-z0-9_].
\W Matches any nonword character. Equivalent to [^A-Za-z0-9_].
\num Matches num, where num is a positive integer. A reference back to remembered matches. \1 matches what is stored in RegExp.$1.
/n/ Matches n, where n is an octal, hexadecimal, or decimal escape value. Allows embedding of ASCII codes into regular expressions.
--------------------------------------------------------------------------------
leslielu 2000-06-28
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没有，要自己写函数。
function BASEisNotNum(theNum){
//判断是否为数字
if (BASEtrim(theNum)=="")
return true;
for(var i=0;i<theNum.length;i++){
oneNum=theNum.substring(i,i+1);
if (oneNum<"0" || oneNum>"9")
return true;
}
return false;
}
function BASEisNotInt(theInt){
//判断是否为整数
theInt=BASEtrim(theInt);
if ((theInt.length>1 && theInt.substring(0,1)=="0") || BASEisNotNum(theInt)){
return true;
}
return false;
}
function BASEisNotFloat(theFloat){
//判断是否为浮点数
len=theFloat.length;
dotNum=0;
if (len==0)
return true;
for(var i=0;i<len;i++){
oneNum=theFloat.substring(i,i+1);
if (oneNum==".")
dotNum++;
if ( ((oneNum<"0" || oneNum>"9") && oneNum!=".") || dotNum>1)
return true;
}
if (len>1 && theFloat.substring(0,1)=="0"){
if (theFloat.substring(1,2)!=".")
return true;
}
return false;
}function BASEtrim(str){
//去掉空格
lIdx=0;rIdx=str.length;
if (BASEtrim.arguments.length==2)
act=BASEtrim.arguments[1].toLowerCase();
else
act="all";
for(var i=0;i<str.length;i++){
thelStr=str.substring(lIdx,lIdx+1);
therStr=str.substring(rIdx,rIdx-1);
if ((act=="all" || act=="left") && thelStr==" "){
lIdx++;
}
if ((act=="all" || act=="right") && therStr==" "){
rIdx--;
}
}
str=str.slice(lIdx,rIdx);
return str;
}
function BASEisNotNum(theNum){
//判断是否为数字
if (BASEtrim(theNum)=="")
return true;
for(var i=0;i<theNum.length;i++){
oneNum=theNum.substring(i,i+1);
if (oneNum<"0" || oneNum>"9")
return true;
}
return false;
}
function BASEisNotInt(theInt){
//判断是否为整数
theInt=BASEtrim(theInt);
if ((theInt.length>1 && theInt.substring(0,1)=="0") || BASEisNotNum(theInt)){
return true;
}
return false;
}
function BASEisNotFloat(theFloat){
//判断是否为浮点数
len=theFloat.length;
dotNum=0;
if (len==0)
return true;
for(var i=0;i<len;i++){
oneNum=theFloat.substring(i,i+1);
if (oneNum==".")
dotNum++;
if ( ((oneNum<"0" || oneNum>"9") && oneNum!=".") || dotNum>1)
return true;
}
if (len>1 && theFloat.substring(0,1)=="0"){
if (theFloat.substring(1,2)!=".")
return true;
}
return false;
}function BASEtrim(str){
//去掉空格
lIdx=0;rIdx=str.length;
if (BASEtrim.arguments.length==2)
act=BASEtrim.arguments[1].toLowerCase();
else
act="all";
for(var i=0;i<str.length;i++){
thelStr=str.substring(lIdx,lIdx+1);
therStr=str.substring(rIdx,rIdx-1);
if ((act=="all" || act=="left") && thelStr==" "){
lIdx++;
}
if ((act=="all" || act=="right") && therStr==" "){
rIdx--;
}
}
str=str.slice(lIdx,rIdx);
return str;
}
