Linux Shell Programming---Parsing email addresses and URLs in text

resolves the e-mail address in the text and URL

(1) , usage scenarios

parsing the required text from a given file is a common task in text processing. such as e-mail addresses,URLs , etc. can be found with appropriate regular expressions. We often need to parse and extract e-mail addresses from an e-mail customer list or HTML page that contains a large number of unrelated characters and words .

(2) , regular match

The regular expression that matches an e-mail address is as follows:

[A-za-z0-9._] [Email protected] [A-za-z0-9.] +\. [A-za-z] {2,4}

Match HTTP URL the regular expression is as follows:

Http://[a-za-z0-9\-\.] +\. [A-za-z] {2,4}

(3) , Example

Example 1 : Match Email

[Email protected]_01t]# cat A5.txt

This is aline of text contains,<email> #[email protected] </email> Andemail address,

Blog "http://www.google.com", [email protected] DFDFDFDDDFDF; [Email protected]<br/>

<ahref= "Http://code.google.com" >

[Email protected]_01t]# cat a5.txt |grep-e-O "[A-za-z0-9._][email protected][a-za-z0-9.] +\. [A-za-z] {2,4} "

[Email protected]

[Email protected]

[Email protected]

[[Email protected]_01t]#

Example 2 : Match URL

[Email protected]_01t]# cat A5.txt

This is aline of text contains,<email> #[email protected] </email> Andemail address,

Blog "http://www.google.com", [email protected]; [Email protected]<br/>

<ahref= "Http://code.google.com" >

[Email protected]_01t]# cat a5.txt |grep-e-O "http://[a-za-z0-9\-\.] +\. [A-za-z] {2,4} "

http://www.google.com

Http://code.google.com

[[Email protected]_01t]#

This article is from the "operation and maintenance of micro-letter" blog, please be sure to keep this source http://weixiaoxin.blog.51cto.com/13270051/1963698

Linux Shell Programming---Parsing email addresses and URLs in text