Regular Expression (Regex) Reference

XY

Catenation

X then Y

X|Y

Alternation

X or Y

(?:X)

Group

Grouping and operator precedence override

(X)

Capturing Group

Grouping and operator precedence override with the additional side-effect of capturing the string for display in a separate column in BareGrep. This is sometimes called a capturing group.

\a

Alert character (bell)

\cx

Control-x character

For example:

\cM

would be equivalent to:

Control-M

Or character ASCII code 0D hexidecimal.

\d

A digit

Any character in the set:

[0-9]

\D

Any non-digit

Any character in the set:

[^0-9]

\e

Escape character

\f

Form feed character

\n

New line character

\r

Carriage return character

\s

Any whitespace character

\S

Any non-whitespace character

\t

Tab character

\nnn

The character with octal value nnn

\w

Any word character

[0-9_A-Za-z]

\W

Any non-word character

[0-9_A-Za-z]

\xhh

The character with hexidecimal value hh

.

Any character

x

The literal character x

[abc]

Character Set

Character a, b or c

[^abc]

Inverse Character Set

Any character other than a, b or c

[a-b]

Character Set Range

Any character in the range a to b

X*

Set Closure

X zero or more times

X+

Kleene Closure

X one or more times