Wildcard  

Description  

% 

Match exactly one character. 

* 

Match zero or more characters, with maximal or “greedy” left-to-right matching 

Back match  

Description  

$ n* 

Match the nth wildcard or glob. 

Modifiers  

Description  

$_ 

Use minimal or “lazy” left-to-right matching. 

$@ 

Turn off “saving” of the succeeding wildcard or glob. 

$^ 

Turn on “saving” of the succeeding wildcard or glob; this is the default. 

Glob wildcard  

Description  

$A% 

Match one alphabetic character, A-Z or a-z. 

$A* 

Match zero or more alphabetic characters, A-Z or a-z. 

$B% 

Match one binary digit (0 or 1). 

$B* 

Match zero or more binary digits (0 or 1). 

$D% 

Match one decimal digit 0-9. 

$D* 

Match zero or more decimal digits 0-9. 

$H% 

Match one hexadecimal digit 0-9 or A-F. 

$H* 

Match zero or more hexadecimal digits 0-9 or A-F. 

$O% 

Match one octal digit 0-7. 

$O* 

Match zero or more octal digits 0-7. 

$S% 

Match one symbol set character, that is, 0-9, A-Z, a-z, _, $. 

$S* 

Match zero or more symbol set characters, that is, 0-9, A-Z, a-z, _, $. 

$T% 

Match one tab or vertical tab or space character. 

$T* 

Match zero or more tab or vertical tab or space characters. 

$X% 

A synonym for $H%. 

$X* 

A synonym for $H*. 

$[ c]% 

Match character c. 

$[ c]* 

Match arbitrary occurrences of character c. 

$[ c₁ c₂ ... c_n ]%

Match exactly one occurrence of character c₁, c₂, or c_n.

$[ c₁ c₂ ... c_n ]*

Match arbitrary occurrences of any characters c₁, c₂, or c_n.

$[ c₁ -c_n ]%

Match any one character in the range c₁ to c_n.

$[ c₁ -c_n ]*

Match arbitrary occurrences of characters in the range c₁ to c_n.

$< IPv4> 

Match an IPv4 address, ignoring bits. 

$(IPv4) 

Match an IPv4 address, keeping prefix bits. 

${IPv6} 

Match an IPv6 address.