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Regular Expressions

Operator Description Example Matches Fails
. Any one character except newline . k  
^ Start of string ^T ^Train Car
$ End of string t$ Artist Train
[chars] Any character between the square brackets [xyzXYZ] Y A
[char range] Any character in the range [a-zA-Z] R 8
\d Any single numeric digit. Shortcut for [0-9] \d\d\d 456 Car
\w Any alphanumeric character or underscore. Shortcut for [a-zA-Z0-9_] \w\w\w Bus 60%
\s Space \d\s\d 1 3 123
\b Boundary of a word \bPhone\b Phone Phonecall
* Previous charcter may occur zero or more times. joy*car jocar jcar
+ Previous charcter may occur once or more times joy+car joyycar car
? Previous charcter may occur once or not at all boats? boat boa
{number} Number of repititions of previous character or string \d{3}
 

("Hi J."){2}
 456
 

"Hi J.Hi J."		 45 34
 

Hi K.
{min, max} Min and max number of repitition of previous character or string \w\w{4, 6)
 

("Bye T"){2, 3}
 totototo
 

"Bye T.Bye T."		 twit
 

"Bye.Bye."
\b Boundary of a word \bPhone\b Phone Phonecall

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(c) Created by B V Wood.

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