======Classes de caractères======

{| border="2" style="padding: 50px; width: 65%;"
! POSIX          !!Description	        !!ASCII                     
|-
|[:alnum:] 	||Alphanumeric characters 	|| [a-zA-Z0-9]                      
|-
|[:alpha:] 	||Alphabetic characters 	|| [a-zA-Z]                         
|-
|[:ascii:] 	||ASCII characters 	        || %% [\x00-\x7F] %%                      
|-
|[:blank:] 	||Space and tab 	        || %% [ \t] %%                    
|-
|[:cntrl:] 	||Control characters 	        || %% [\x00-\x1F\x7F] %%                
|-
|[:digit:] 	||Digits 	                || %% [0-9] %%                         
|-
|[:graph:] 	||Visible characters (anything except spaces and control characters) || %% [\x21-\x7E] %%
|-
|[:lower:] 	||Lowercase letters 	        || %% [a-z] %%                   
|-
|[:print:] 	||Visible characters and spaces (anything except control characters)|| %% [\x20-\x7E] %% 
|-
|[:punct:] 	||Punctuation (and symbols). 	|| %% [!"\#$%&'()*+,\-./:;<=>?@\[\\\]^_‘{|}~] %%
|-
|[:space:] 	||All whitespace characters, including line breaks || %% [ \t\r\n\v\f] %%
|-
|[:upper:] 	||Uppercase letters 	        || %% [A-Z] %%                           
|-
|[:word:] 	||Word characters (letters, numbers and underscores) 	|| %% [A-Za-z0-9_]  %%
|-
|[:xdigit:] 	||Hexadecimal digits 	        || %% [A-Fa-f0-9][A-Fa-f0-9] %%
|-   
|}