[JavaScript]正则表达式学习-优快云博客

博客主要围绕正则表达式展开，介绍了字符串结尾、选择等概念，还提及了String.match()、String.replace()与子表达式引用，以及词语边界、RegExp.multiline属性和RegExp类属性列表等内容，涉及JavaScript、VB、VBScript等。

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$字符串的结尾：

document.write("bitan".search(/n$/) + "," + "bitan".search(/it/));

4,1

|选择：

var a = "2005-9-13 12:05:36".split(/(-|\s|:)+/);
for (i in a)
{
document.write("[" + i + "=" + a[i] + "];");
}

[0=2005];[1=9];[2=13];[3=12];[4=05];[5=36];

String.match()与子表达式引用：

var a = "2005-9-13 12:05:36".match(/(\d+)-(\d+)-(\d+)\s+(\d+):(\d+):(\d+)/g );
for (i in a)
{
document.write("[" + i + "=" + a[i] + "]; ");
}
document.write("------------------------- ");
var a = "2005-9-13 12:05:36".match(/(\d+)-(\d+)-(\d+)\s+(\d+):(\d+):(\d+)/);
for (i in a)
{
document.write("[" + i + "=" + a[i] + "]; ");
}

document.write("------------------------- ");
var a = "23.0234182345305".match(/(\d+)\.(\d{1,4})/);
for (i in a)
{
document.write("[" + i + "=" + a[i] + "]; ");
}

[input=2005-9-13 12:05:36];
[0=2005-9-13 12:05:36];
[index=0];
[lastIndex=18];
-------------------------
[input=2005-9-13 12:05:36];
[index=0];
[lastIndex=18];
[0=2005-9-13 12:05:36];
[1=2005];
[2=9];
[3=13];
[4=12];
[5=05];
[6=36];
-------------------------
[input=23.0234182345305];
[index=0];
[lastIndex=7];
[0=23.0234];
[1=23];
[2=0234];

String.replace()与子表达式引用：

var a = "2005-04-15 12:05:32".replace(/\d+(-|\s|:) \d+\1 \d+(-|\s|:) \d+(-|\s|:) \d+\3 \d+/, "####$1 ##$1 ##$2 ##$3 ##$3 ##");
document.write(a);

####-##-## ##:##:##

\b词语边界：

document.write("Java is not JavaScript".replace(/\b Java\b /gi,"VB") + " ");
document.write("Java is not JavaScript".replace(/Java/gi,"VB"));

VB is not JavaScript
VB is not VBScript

RegExp.multiline属性：

var s = "I come.\n I see.\n I conquer.\n ";
document.write(s.search(/see\.$ /) + " ");
RegExp.multiline = true;
document.write(s.search(/see\.$ /) + " ");