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JavaScript之Match,Test和Exec
作者: wzhu 时间: 2008-10-28 09:55:23
JavaScript中经常用到正则表达式, 而正则表达式中经常用到Match和Test这两个函数,当然还有Exec. 这里以代码实例来区分它们之间的不同吧.
Match Example
var str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var regexp = /[A-E]/gi;
var rs = str.match(regexp);
//rs= Array('A', 'B', 'C', 'D', 'E', 'a', 'b', 'c', 'd', 'e');
Test Example
var str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var regexp = /[A-E]/gi;
var rs = regexp.test(str);
// rs = true; boolean
Exc Example
var str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var regexp = /[A-E]/gi;
var rs;
while ((rs = regexp.exec(str)) != null)
{
document.write(rs);
document.write(regexp.lastIndex);
document.write("<br />");
}
OUTPUT
---------------------------------
A 1
B 2
C 3
D 4
E 5
a 27
b 28
c 29
d 30
e 31
Another Exc Example
var regexp = /ab*/g;
var str = "abbcdefabh";
var rs;
while ((rs = regexp.exec(str)) != null)
{
document.write(rs);
document.write(regexp.lastIndex);
document.write("<br />");
}
OUTPUT
---------------------------------
abb 3
ab 9 |
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