To get more exact information see Henry Spencers regex.7 manual. +
To get more exact information see Henry Spencer's regex.7 manual.
This is a simplistic reference that skips the details. From here on -a regualr expressions is called a regexp. +a regular expression is called a regexp.
A regular expression describes a set of strings. The simplest case is one that has no special characters in it. For example the regexp hello @@ -28,7 +28,7 @@ matches hello and nothing else. they can match more than one string. For example, the regexp hello|word matches either the string hello or the string word. -
And a more comples example regexp B[an]*s matches any of the +
And a more complex example regexp B[an]*s matches any of the strings Bananas, Baaaaas, Bs and all other string starting with a B and continuing with any number of a n and ending with a s.