use xpath to extract web info in google chrome console

example:

var a = $x('//b[contains(., "人均")]/text()')

jQuery(a).text()

--
Feng

快速选择dropbox 的重复图片

因为把两个DROPBOX的 camera upload 文件合并了, 有不少重复的文件, dropbox 在重复的文件名后面加了 (1), 所以可以很容易看出重复的文件. 

但是有一百多个文件, 手工一个个找出来不容易, 于是写了段代码把不重复的文件隐藏起来.

在浏览器的命令行输入以下代码, 把正常的文件名藏起. 然后剩下的全是重复的, 就按住CONTROL键点选, 然后删除就可以了. 只是免了翻页寻找的过程. 并不能帮你选起.

注意, 不能用SHFIT键多选, 因为这样会选到藏起来的那些文件.

jQuery('.browse-file').each(

function(index, elem){

if (!/\(1\)/.test(jQuery(this).html())){

jQuery(this).hide();

}

}

);

--
Feng

YuFeng Deng's invitation is awaiting your response

YuFeng Deng would like to connect on LinkedIn. How would you like to respond? YuFeng Deng Senior Software Developer @ MCom (Now Fiserv) - Doing Mobile, Web and Platform developments Confirm you know YuFeng You are receiving Reminder emails for pending invitations. Unsubscribe © 2014, LinkedIn Corporation. 2029 Stierlin Ct. Mountain View, CA 94043, USA

YuFeng Deng's invitation is awaiting your response

YuFeng Deng would like to connect on LinkedIn. How would you like to respond? YuFeng Deng Senior Software Developer @ MCom (Now Fiserv) - Doing Mobile, Web and Platform developments Confirm you know YuFeng You are receiving Reminder emails for pending invitations. Unsubscribe © 2014, LinkedIn Corporation. 2029 Stierlin Ct. Mountain View, CA 94043, USA

regex, how look behind work

Look behind doesn't take space either

Look this example

(?m)(?<=a)bc.(?<=a)bc

it will only match abcabc

the matched string is bcabc

how to read this regex?

Remove the look behind first

it becomes bc.bc

OK, this will match quite a few string, like dbcebc

but, remember we have look behind, that means, before first bc, it must be an a, before second bc, it must be another a there. so....

only abcabc will match.

Look behind add another layer of restriction. easy?

--
Feng

Regex "And" operation

Regex "Or" operation is obvious.

This is a example

^abc$|^123$

This will match abc or 123. 

But how do you do a regex "and"

You may write something like this:

^abc$&^123$

Wrong, this is totally wrong. There is not "&" operator in regex.

Is it possible to do an "And" operation in regex? 

The answer is "YES".

That leads us to the power regex look around feature. 

For "And" operation, what we need is the positive look ahead.

(?m)^(?=.*[A-Z].*)(?=.*[a-z].*)(?=.*?[0-9].*)[^1]*$

Have a look example above. 

Look head matches, but doesn't take space, That means, the regex after the look ahead will start matching from the beginning as well.

In this example, the only matched string will be Abcd5234. 

Abcd1234

ABCD1234

abcd1234

abcdabcd

aBcd1234

aBcdabcd

Abcd5234

Why?

Because this string must match ^(?=.*[A-Z].*), means at least 1 Capital letter. 

Also, it must match (?=.*[a-z].*), one lowercase letter. 

Also, it must match (?=.*?[0-9].*), one number

and lastly, it must match [^1]*, no "1" included.

--
Feng