Google
Web tarasdom.com

 

Regular expressions

See also Information about M4 preprocessor

Symbol Description ed vi/
ex
sed/
grep
awk/
egrep
. Match any character + + + +
* Match zero or more + + + +
^ Match beginning of the line + + + +
$ Match end of the line + + + +
\ Escape next charater + + + +
[ ] Match one from a set + + + +
\( \) Store pattern for replay + + +  
\n n-th stored pattern + + +  
{ } Match a range of instances       P
\{ \} Match a range of instances +   +  
\< \> Match a word + +   g
+ Match one or more       +
? Match zero or one       +
| Separator for choices       +
{ } Group expressions       +
  • + : implemented feature
  • P : POSIX standard feature
  • g : gawk feature

Books about the subject:

©
Page was modified 20.06.2006