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translating 'basic matches'

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@ -57,24 +57,21 @@ A expressão regular acima aceita as strings `john_doe`, `jo-hn_doe` e `john12_a
## 1. Combinações Básicas ## 1. Combinações Básicas
A regular expression is just a pattern of characters that we use to perform search in a text. For example, the regular expression Uma expressão regular é apenas um padrão de caracteres que usamos para fazer busca em um texto. Por exemplo, a expressão regular `the` significa: a letra `t`, seguida da letra `h`, seguida da letra `e`.
`the` means: the letter `t`, followed by the letter `h`, followed by the letter `e`.
<pre> <pre>
"the" => The fat cat sat on <a href="#learn-regex"><strong>the</strong></a> mat. "the" => The fat cat sat on <a href="#learn-regex"><strong>the</strong></a> mat.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/dmRygT/1) [Teste a RegExp](https://regex101.com/r/dmRygT/1)
The regular expression `123` matches the string `123`. The regular expression is matched against an input string by comparing each A expressão regular `123` corresponde a string `123`. A expressão regular é comparada com uma string de entrada, comparando cada caractere da expressão regular para cada caractere da string de entrada, um após o outro. Expressões regulares são normalmente case-sensitive (sensíveis à maiúsculas), então a expressão regular `The` não vai bater com a string `the`.
character in the regular expression to each character in the input string, one after another. Regular expressions are normally
case-sensitive so the regular expression `The` would not match the string `the`.
<pre> <pre>
"The" => <a href="#learn-regex"><strong>The</strong></a> fat cat sat on the mat. "The" => <a href="#learn-regex"><strong>The</strong></a> fat cat sat on the mat.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/1paXsy/1) [Teste a RegExp](https://regex101.com/r/1paXsy/1)
## 2. Metacaracteres ## 2. Metacaracteres
@ -107,7 +104,7 @@ letter `r`.
".ar" => The <a href="#learn-regex"><strong>car</strong></a> <a href="#learn-regex"><strong>par</strong></a>ked in the <a href="#learn-regex"><strong>gar</strong></a>age. ".ar" => The <a href="#learn-regex"><strong>car</strong></a> <a href="#learn-regex"><strong>par</strong></a>ked in the <a href="#learn-regex"><strong>gar</strong></a>age.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/xc9GkU/1) [Teste a RegExp](https://regex101.com/r/xc9GkU/1)
## 2.2 Conjunto de caracteres ## 2.2 Conjunto de caracteres
@ -119,7 +116,7 @@ expression `[Tt]he` means: an uppercase `T` or lowercase `t`, followed by the le
"[Tt]he" => <a href="#learn-regex"><strong>The</strong></a> car parked in <a href="#learn-regex"><strong>the</strong></a> garage. "[Tt]he" => <a href="#learn-regex"><strong>The</strong></a> car parked in <a href="#learn-regex"><strong>the</strong></a> garage.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/2ITLQ4/1) [Teste a RegExp](https://regex101.com/r/2ITLQ4/1)
A period inside a character set, however, means a literal period. The regular expression `ar[.]` means: a lowercase character `a`, followed by letter `r`, followed by a period `.` character. A period inside a character set, however, means a literal period. The regular expression `ar[.]` means: a lowercase character `a`, followed by letter `r`, followed by a period `.` character.
@ -127,7 +124,7 @@ A period inside a character set, however, means a literal period. The regular ex
"ar[.]" => A garage is a good place to park a c<a href="#learn-regex"><strong>ar.</strong></a> "ar[.]" => A garage is a good place to park a c<a href="#learn-regex"><strong>ar.</strong></a>
</pre> </pre>
[Test the regular expression](https://regex101.com/r/wL3xtE/1) [Teste a RegExp](https://regex101.com/r/wL3xtE/1)
### 2.2.1 Conjunto de caracteres negados ### 2.2.1 Conjunto de caracteres negados
@ -139,7 +136,7 @@ the letter `r`.
"[^c]ar" => The car <a href="#learn-regex"><strong>par</strong></a>ked in the <a href="#learn-regex"><strong>gar</strong></a>age. "[^c]ar" => The car <a href="#learn-regex"><strong>par</strong></a>ked in the <a href="#learn-regex"><strong>gar</strong></a>age.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/nNNlq3/1) [Teste a RegExp](https://regex101.com/r/nNNlq3/1)
## 2.3 Repetições ## 2.3 Repetições
@ -156,7 +153,7 @@ character set. For example, the regular expression `[a-z]*` means: any number of
"[a-z]*" => T<a href="#learn-regex"><strong>he</strong></a> <a href="#learn-regex"><strong>car</strong></a> <a href="#learn-regex"><strong>parked</strong></a> <a href="#learn-regex"><strong>in</strong></a> <a href="#learn-regex"><strong>the</strong></a> <a href="#learn-regex"><strong>garage</strong></a> #21. "[a-z]*" => T<a href="#learn-regex"><strong>he</strong></a> <a href="#learn-regex"><strong>car</strong></a> <a href="#learn-regex"><strong>parked</strong></a> <a href="#learn-regex"><strong>in</strong></a> <a href="#learn-regex"><strong>the</strong></a> <a href="#learn-regex"><strong>garage</strong></a> #21.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/7m8me5/1) [Teste a RegExp](https://regex101.com/r/7m8me5/1)
The `*` symbol can be used with the meta character `.` to match any string of characters `.*`. The `*` symbol can be used with the The `*` symbol can be used with the meta character `.` to match any string of characters `.*`. The `*` symbol can be used with the
whitespace character `\s` to match a string of whitespace characters. For example, the expression `\s*cat\s*` means: zero or more whitespace character `\s` to match a string of whitespace characters. For example, the expression `\s*cat\s*` means: zero or more
@ -167,7 +164,7 @@ zero or more spaces.
"\s*cat\s*" => The fat<a href="#learn-regex"><strong> cat </strong></a>sat on the <a href="#learn-regex">con<strong>cat</strong>enation</a>. "\s*cat\s*" => The fat<a href="#learn-regex"><strong> cat </strong></a>sat on the <a href="#learn-regex">con<strong>cat</strong>enation</a>.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/gGrwuz/1) [Teste a RegExp](https://regex101.com/r/gGrwuz/1)
### 2.3.2 O Sinal de Adição ### 2.3.2 O Sinal de Adição
@ -178,7 +175,7 @@ letter `c`, followed by at least one character, followed by the lowercase charac
"c.+t" => The fat <a href="#learn-regex"><strong>cat sat on the mat</strong></a>. "c.+t" => The fat <a href="#learn-regex"><strong>cat sat on the mat</strong></a>.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/Dzf9Aa/1) [Teste a RegExp](https://regex101.com/r/Dzf9Aa/1)
### 2.3.3 O Ponto de Interrogação ### 2.3.3 O Ponto de Interrogação
@ -190,13 +187,13 @@ character `h`, followed by the lowercase character `e`.
"[T]he" => <a href="#learn-regex"><strong>The</strong></a> car is parked in the garage. "[T]he" => <a href="#learn-regex"><strong>The</strong></a> car is parked in the garage.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/cIg9zm/1) [Teste a RegExp](https://regex101.com/r/cIg9zm/1)
<pre> <pre>
"[T]?he" => <a href="#learn-regex"><strong>The</strong></a> car is parked in t<a href="#learn-regex"><strong>he</strong></a> garage. "[T]?he" => <a href="#learn-regex"><strong>The</strong></a> car is parked in t<a href="#learn-regex"><strong>he</strong></a> garage.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/kPpO2x/1) [Teste a RegExp](https://regex101.com/r/kPpO2x/1)
## 2.4 Chaves ## 2.4 Chaves
@ -208,7 +205,7 @@ characters in the range of 0 to 9).
"[0-9]{2,3}" => The number was 9.<a href="#learn-regex"><strong>999</strong></a>7 but we rounded it off to <a href="#learn-regex"><strong>10</strong></a>.0. "[0-9]{2,3}" => The number was 9.<a href="#learn-regex"><strong>999</strong></a>7 but we rounded it off to <a href="#learn-regex"><strong>10</strong></a>.0.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/juM86s/1) [Teste a RegExp](https://regex101.com/r/juM86s/1)
We can leave out the second number. For example, the regular expression `[0-9]{2,}` means: Match 2 or more digits. If we also remove We can leave out the second number. For example, the regular expression `[0-9]{2,}` means: Match 2 or more digits. If we also remove
the comma the regular expression `[0-9]{3}` means: Match exactly 3 digits. the comma the regular expression `[0-9]{3}` means: Match exactly 3 digits.
@ -217,13 +214,13 @@ the comma the regular expression `[0-9]{3}` means: Match exactly 3 digits.
"[0-9]{2,}" => The number was 9.<a href="#learn-regex"><strong>9997</strong></a> but we rounded it off to <a href="#learn-regex"><strong>10</strong></a>.0. "[0-9]{2,}" => The number was 9.<a href="#learn-regex"><strong>9997</strong></a> but we rounded it off to <a href="#learn-regex"><strong>10</strong></a>.0.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/Gdy4w5/1) [Teste a RegExp](https://regex101.com/r/Gdy4w5/1)
<pre> <pre>
"[0-9]{3}" => The number was 9.<a href="#learn-regex"><strong>999</strong></a>7 but we rounded it off to 10.0. "[0-9]{3}" => The number was 9.<a href="#learn-regex"><strong>999</strong></a>7 but we rounded it off to 10.0.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/Sivu30/1) [Teste a RegExp](https://regex101.com/r/Sivu30/1)
## 2.5 Grupo de Caracteres ## 2.5 Grupo de Caracteres
@ -237,7 +234,7 @@ We can also use the alternation `|` meta character inside character group. For e
"(c|g|p)ar" => The <a href="#learn-regex"><strong>car</strong></a> is <a href="#learn-regex"><strong>par</strong></a>ked in the <a href="#learn-regex"><strong>gar</strong></a>age. "(c|g|p)ar" => The <a href="#learn-regex"><strong>car</strong></a> is <a href="#learn-regex"><strong>par</strong></a>ked in the <a href="#learn-regex"><strong>gar</strong></a>age.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/tUxrBG/1) [Teste a RegExp](https://regex101.com/r/tUxrBG/1)
## 2.6 Alternância ## 2.6 Alternância
@ -251,7 +248,7 @@ or lowercase character `c`, followed by lowercase character `a`, followed by low
"(T|t)he|car" => <a href="#learn-regex"><strong>The</strong></a> <a href="#learn-regex"><strong>car</strong></a> is parked in <a href="#learn-regex"><strong>the</strong></a> garage. "(T|t)he|car" => <a href="#learn-regex"><strong>The</strong></a> <a href="#learn-regex"><strong>car</strong></a> is parked in <a href="#learn-regex"><strong>the</strong></a> garage.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/fBXyX0/1) [Teste a RegExp](https://regex101.com/r/fBXyX0/1)
## 2.7 Escapando Caracteres Especiais ## 2.7 Escapando Caracteres Especiais
@ -265,7 +262,7 @@ expression `(f|c|m)at\.?` means: lowercase letter `f`, `c` or `m`, followed by l
"(f|c|m)at\.?" => The <a href="#learn-regex"><strong>fat</strong></a> <a href="#learn-regex"><strong>cat</strong></a> sat on the <a href="#learn-regex"><strong>mat.</strong></a> "(f|c|m)at\.?" => The <a href="#learn-regex"><strong>fat</strong></a> <a href="#learn-regex"><strong>cat</strong></a> sat on the <a href="#learn-regex"><strong>mat.</strong></a>
</pre> </pre>
[Test the regular expression](https://regex101.com/r/DOc5Nu/1) [Teste a RegExp](https://regex101.com/r/DOc5Nu/1)
## 2.8 Âncoras ## 2.8 Âncoras
@ -286,13 +283,13 @@ followed by lowercase character `h`, followed by lowercase character `e`.
"(T|t)he" => <a href="#learn-regex"><strong>The</strong></a> car is parked in <a href="#learn-regex"><strong>the</strong></a> garage. "(T|t)he" => <a href="#learn-regex"><strong>The</strong></a> car is parked in <a href="#learn-regex"><strong>the</strong></a> garage.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/5ljjgB/1) [Teste a RegExp](https://regex101.com/r/5ljjgB/1)
<pre> <pre>
"^(T|t)he" => <a href="#learn-regex"><strong>The</strong></a> car is parked in the garage. "^(T|t)he" => <a href="#learn-regex"><strong>The</strong></a> car is parked in the garage.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/jXrKne/1) [Teste a RegExp](https://regex101.com/r/jXrKne/1)
### 2.8.2 Sinal de Dólar ### 2.8.2 Sinal de Dólar
@ -304,13 +301,13 @@ must be end of the string.
"(at\.)" => The fat c<a href="#learn-regex"><strong>at.</strong></a> s<a href="#learn-regex"><strong>at.</strong></a> on the m<a href="#learn-regex"><strong>at.</strong></a> "(at\.)" => The fat c<a href="#learn-regex"><strong>at.</strong></a> s<a href="#learn-regex"><strong>at.</strong></a> on the m<a href="#learn-regex"><strong>at.</strong></a>
</pre> </pre>
[Test the regular expression](https://regex101.com/r/y4Au4D/1) [Teste a RegExp](https://regex101.com/r/y4Au4D/1)
<pre> <pre>
"(at\.)$" => The fat cat. sat. on the m<a href="#learn-regex"><strong>at.</strong></a> "(at\.)$" => The fat cat. sat. on the m<a href="#learn-regex"><strong>at.</strong></a>
</pre> </pre>
[Test the regular expression](https://regex101.com/r/t0AkOd/1) [Teste a RegExp](https://regex101.com/r/t0AkOd/1)
## 3. Forma Abreviada de Conjunto de Caracteres ## 3. Forma Abreviada de Conjunto de Caracteres
@ -355,7 +352,7 @@ followed by letter `h`, followed by letter `e`. In parentheses we define positiv
"[T|t]he(?=\sfat)" => <a href="#learn-regex"><strong>The</strong></a> fat cat sat on the mat. "[T|t]he(?=\sfat)" => <a href="#learn-regex"><strong>The</strong></a> fat cat sat on the mat.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/IDDARt/1) [Teste a RegExp](https://regex101.com/r/IDDARt/1)
### 4.2 Lookahead Negativo ### 4.2 Lookahead Negativo
@ -368,7 +365,7 @@ input string that are not followed by the word `fat` precedes by a space charact
"[T|t]he(?!\sfat)" => The fat cat sat on <a href="#learn-regex"><strong>the</strong></a> mat. "[T|t]he(?!\sfat)" => The fat cat sat on <a href="#learn-regex"><strong>the</strong></a> mat.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/V32Npg/1) [Teste a RegExp](https://regex101.com/r/V32Npg/1)
### 4.3 Lookbehind Positivo ### 4.3 Lookbehind Positivo
@ -380,7 +377,7 @@ are after the word `The` or `the`.
"(?<=[T|t]he\s)(fat|mat)" => The <a href="#learn-regex"><strong>fat</strong></a> cat sat on the <a href="#learn-regex"><strong>mat</strong></a>. "(?<=[T|t]he\s)(fat|mat)" => The <a href="#learn-regex"><strong>fat</strong></a> cat sat on the <a href="#learn-regex"><strong>mat</strong></a>.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/avH165/1) [Teste a RegExp](https://regex101.com/r/avH165/1)
### 4.4 Lookbehind Negativo ### 4.4 Lookbehind Negativo
@ -392,7 +389,7 @@ are not after the word `The` or `the`.
"(?&lt;![T|t]he\s)(cat)" => The cat sat on <a href="#learn-regex"><strong>cat</strong></a>. "(?&lt;![T|t]he\s)(cat)" => The cat sat on <a href="#learn-regex"><strong>cat</strong></a>.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/8Efx5G/1) [Teste a RegExp](https://regex101.com/r/8Efx5G/1)
## 5. Flags ## 5. Flags
@ -416,13 +413,13 @@ the whole input string.
"The" => <a href="#learn-regex"><strong>The</strong></a> fat cat sat on the mat. "The" => <a href="#learn-regex"><strong>The</strong></a> fat cat sat on the mat.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/dpQyf9/1) [Teste a RegExp](https://regex101.com/r/dpQyf9/1)
<pre> <pre>
"/The/gi" => <a href="#learn-regex"><strong>The</strong></a> fat cat sat on <a href="#learn-regex"><strong>the</strong></a> mat. "/The/gi" => <a href="#learn-regex"><strong>The</strong></a> fat cat sat on <a href="#learn-regex"><strong>the</strong></a> mat.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/ahfiuh/1) [Teste a RegExp](https://regex101.com/r/ahfiuh/1)
### 5.2 Busca Global ### 5.2 Busca Global
@ -435,13 +432,13 @@ string.
"/.(at)/" => The <a href="#learn-regex"><strong>fat</strong></a> cat sat on the mat. "/.(at)/" => The <a href="#learn-regex"><strong>fat</strong></a> cat sat on the mat.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/jnk6gM/1) [Teste a RegExp](https://regex101.com/r/jnk6gM/1)
<pre> <pre>
"/.(at)/g" => The <a href="#learn-regex"><strong>fat</strong></a> <a href="#learn-regex"><strong>cat</strong></a> <a href="#learn-regex"><strong>sat</strong></a> on the <a href="#learn-regex"><strong>mat</strong></a>. "/.(at)/g" => The <a href="#learn-regex"><strong>fat</strong></a> <a href="#learn-regex"><strong>cat</strong></a> <a href="#learn-regex"><strong>sat</strong></a> on the <a href="#learn-regex"><strong>mat</strong></a>.
</pre> </pre>
[Test the regular expression](https://regex101.com/r/dO1nef/1) [Teste a RegExp](https://regex101.com/r/dO1nef/1)
### 5.3 Multilinhas ### 5.3 Multilinhas
@ -456,7 +453,7 @@ line. And because of `m` flag now regular expression engine matches pattern at t
on the <a href="#learn-regex"><strong>mat.</strong></a> on the <a href="#learn-regex"><strong>mat.</strong></a>
</pre> </pre>
[Test the regular expression](https://regex101.com/r/hoGMkP/1) [Teste a RegExp](https://regex101.com/r/hoGMkP/1)
<pre> <pre>
"/.at(.)?$/gm" => The <a href="#learn-regex"><strong>fat</strong></a> "/.at(.)?$/gm" => The <a href="#learn-regex"><strong>fat</strong></a>
@ -464,7 +461,7 @@ line. And because of `m` flag now regular expression engine matches pattern at t
on the <a href="#learn-regex"><strong>mat.</strong></a> on the <a href="#learn-regex"><strong>mat.</strong></a>
</pre> </pre>
[Test the regular expression](https://regex101.com/r/E88WE2/1) [Teste a RegExp](https://regex101.com/r/E88WE2/1)
## Bônus ## Bônus