Regex

regex

only lower case, nubers or dots'/[^a-z0-9.]/'

no dots: ^[^\.]*$

^ - beginning of string
[^\.]* - any character except ., any number of repetitions
$ - end of string

to take out all non alpha characters (Ruby)

 test_str = "Madam, I'm Adam"
 str = test_str.gsub(/[^a-zA-Z]/,'')
 puts str
returns MadamImAdam

• ^[ \t]+ //finds all the space and tabs
• [1-9]\. //finds all the line numbers. (replace with #)
• [A-E]\. //find A. etc (replace with ##)

to clean special characters from a string

$clean = preg_replace("/^[^a-z0-9]?(.*?)[^a-z0-9]?$/i", "$1", $text);

sites

• http://rubular.com
• http://e-texteditor.com/blog/2010/beyond-vi
• http://www.grymoire.com/Unix/Regular.html#uh-2
• http://www.regular-expressions.info/php.html
• http://www.bluebox.net/about/blog/2013/02/using-regular-expressions-in-ruby-part-1-of-3/

expressions

If you want to get'Aloha World'out

Input:

Hello World

Aloha World

Hey There

RegEx:

  \<div\sclass\=\"somename\"\>(?<Text>.*?)\<\/div\>

Yields:

Aloha World (note: In a single group named Text)