Expressões Regulares / Regular Expressions
X
Âncoras / Anchors
^- Start of string
\A- Start of string
$- End of string
\Z- End of string
\b- Word boundary
\B- Not word boundary
\<- Start of word
\>- End of word
Classes de caracteres / 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
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
Assertions
?=- Lookahead assertion
?!- Negative lookahead
?<=- Lookbehind assertion
?!= or ?- Negative lookbehind
?>- Once-only Subexpression
?()- Condition [if then]
?()|- Condition [if then else]
?#- Comment
Quantificadores / Quantifyers
*- 0 or more
+- 1 or more
?- 0 or 1
{3}- Exactly 3
{3,}- 3 or more
{3,5}- 3, 4 or 5
Midificador de quantificadores / Quantifier Modifiers
"x"- below represents a quantifier
x?- Ungreedy version of "x"
Escapa / Escape
\- Escape character
Caracteres especiais / Special Characters
\n- New line
\r- Carriage return
\t- Tab
\v- Vertical tab
\f- Form feed
\xxx- Octal character xxx
\xhh- Hex character hh
Grupos e intervalos / Groups and Ranges
.- Any character except new line (\n)
(a|b)- a or b
(...)- Group
(?:...)- Passive Group
[abc]- Range (a or b or c)
[^abc]- Not a or b or c
[a-q]- Letter between a and q
[A-Q]- Upper case letter between A and Q
[0-7]- Digit between 0 and 7
- \n
- nth group/subpattern
Modificador de chaves / Pattern Modifiers
g- Global match
i- Case-insensitive
m- Multiple lines
s- Treat string as single line
x- Allow comments and white space in pattern
e- Evaluate replacement
U- Ungreedy pattern
Troca de texto retrovisor / String Replacement (Backreferences)
$n- nth non-passive group
$2- "xyz" in /^(abc(xyz))$/
$1- "xyz" in /^(?:abc)(xyz)$/
$`- Before matched string
$'- After matched string
$+- Last matched string
$&- Entire matched string
Exemplos úteis / Handy examples
([A-Za-z0-9-]+)Letters, numbers and hyphens(\d{1,2}\/\d{1,2}\/\d{4})Date (e.g. 21/3/2006)([^\s]+(?=\.(jpg|gif|png))\.\2)jpg, gif or png image(^[1-9]{1}$|^[1-4]{1}[0-9]{1}$|^50$)Any number from 1 to 50 inclusive(#?([A-Fa-f0-9]){3}(([A-Fa-f0-9]){3})?)Valid hexadecimal colour code((?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,15})String with at least one upper case letter, one lower case letter, and one digit (useful for passwords).^(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6}$Email addresses(\<(/?[^\>]+)\>)HTML Tags
