Quanti­fiers

*

0 or more

{3}

Exactly 3

+

1 or more

{3,}

3 or more

?

0 or 1

{3,5}

3, 4 or 5

Add a ? to a quantifier to make it ungreedy.

 

Anchors

^

Start of string, or start of line in multi-line pattern

\A

Start of string

$

End of string, or end of line in multi-line pattern

\Z

End of string

\b

Word boundary

\B

Not word boundary

\<

Start of word

\>

End of word

 

Assertions

?=

Lookahead assertion

?!

Negative lookahead

?<=

Lookbehind assertion

?!= or ?<!

Negative lookbehind

?>

Once-only Subexp­ression

?()

Condition [if then]

?()|

Condition [if then else]

?#

Comment

 

Groups and Ranges

.

Any character except new line (\n)

(a|b)

a or b

(...)

Group

(?:...)

Passive (non-c­apt­uring) group

[abc]

Range (a or b or c)

[^abc]

Not (a or b or c)

[a-q]

Lower case letter from a to q

[A-Q]

Upper case letter from A to Q

[0-7]

Digit from 0 to 7

\x

Group/­sub­pattern number "­x"

Ranges are inclusive.

Character Classes

\c

Control character

\s

White space

\S

Not white space

\d

Digit

\D

Not digit

\w

Word

\W

Not word

\x

Hexade­cimal digit

\O

Octal digit

 

Escape Sequences

\

Escape following character

\Q

Begin literal sequence

\E

End literal sequence

"­Esc­api­ng" is a way of treating characters

which have a special meaning in regular

expres­sions literally, rather than as special charac­ters.

 

Pattern Modifiers

g

Global match

i *

Case-i­nse­nsitive

m *

Multiple lines

s *

Treat string as single line

x *

Allow comments and whitespace in pattern

e *

Evaluate replac­ement

U *

Ungreedy pattern

* PCRE modifier

 

String Replac­ement

$n

nth non-pa­ssive group

$2

"­xyz­" in /^(abc­(xy­z))$/

$1

"­xyz­" in /^(?:a­bc)­(xyz)$/

$`

Before matched string

$'

After matched string

$+

Last matched string

$&

Entire matched string

Some regex implem­ent­ations use \ instead of $.

Common Metach­ara­cters

^

[

.

$

{

*

(

\

+

)

|

?

< 

> 

   

The escape character is usually \

 

 POSIX

[:upper:]

Upper case letters

[:lower:]

Lower case letters

[:alpha:]

All letters

[:alnum:]

Digits and letters

[:digit:]

Digits

[:xdigit:]

Hexade­cimal digits

[:punct:]

Punctu­ation

[:blank:]

Space and tab

[:space:]

Blank characters

[:cntrl:]

Control characters

[:graph:]

Printed characters

[:print:]

Printed characters and spaces

[:word:]

Digits, letters and underscore

 

Special Characters

\n

New line

\r

Carriage return

\t

Tab

\v

Vertical tab

\f

Form feed

\xxx

Octal character xxx

\xhh

Hex character hh

 

Case Conversion

\l

Make next character lowercase

\u

Make next character uppercase

\L

Make entire string (up to \E) lowercase

\U

Make entire string (up to \E) uppercase

\u\L 

Capitalize first char, lowercase rest (sentence)

Source: davechild

 

Typická přihlašovací jména a hesla do administrace routerů

Výrobce, značka              Typická tovární kombinace jména a hesla správce

Airlive (Ovislink)              admin/admin, admin/airlive, admin/airlive

Asus                                     admin/admin, -/admin

Belkin                                  -/-, -/admin

D-Link                                  admin/-, admin/admin, user/-, user/user

Edimax                                admin/1234

Netgear                               admin/admin, admin/password, admin/-, super/5777364

Linksys                                -/admin, admin/admin, admin/-

Tenda                                  admin/admin

TP-Link                                admin/admin

Zyxel                                    -/1234, admin/1234, admin/admin

Webová administrace:

192.168.1.1, 192.168.2.1, 192.168.0.1, 192.168.1.254, 192.168.100.254, 192.168.0.50, 10.0.0.138.