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Specific characters

Anchors

Basic metacharacters

Character classes

Comments

Control and code

Grouping

Look around

Mode modifiers

Quantifiers

Specific characters

Unless they are a metacharacter or part of a combination, all characters represent themselves. Not every character is as easily typed on a keyboard, however. For that reason you can also use a couple of traditional escapes and metasymbols in regular expressions.

bullet Character escapes

bullet Metasymbols

Character escapes

 

Item

 

Meaning:

 
 

\0

 

Null character

 
 

\a

 

Alarm

 
 

\b

 

Backspace (Only in a character class.)

 
 

\e

 

Escape

 
 

\f

 

Form feed

 
 

\n

 

Newline

 
 

\r

 

Return

 
 

\t

 

Tab

 
 

Metasymbols

 

Item

 

Matches:

 
 

\cX

 

A named control character.
For example \cC for control-C, \c[ for ESC and \c? for DEL.

 
 

\DDD

 

A character specified by using a two- or three-digit octal number.
In Perl (and RegExhibit) the leading 0 is optional for values above 010. Single digits are always assumed to be a backreference; multiple digits only if there are as many backreferences.

 
 

\xHEX

 

A character specified by using one or two heximal digits, e.g. \x5E.
You can only use one digit is the next character is not a (possible) heximal digit.

 
 

\x{LONGHEX}

 

A character specified by using as many heximal digits as you like, \x{211B}.

 

\N{NAME}

A named character.
This is not supported by RegExhibit.