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@ -35,7 +35,7 @@ A regular expression is just a pattern of letters and digits that we used to sea
`cat` means: the letter `c`, followed by the letter `a`, followed by the letter `t`.
<pre>
"cat" => The <strong><u>cat</u></strong> sat on the mat
"cat" => The <strong><a href="#learn-regex">cat</a></strong> sat on the mat
</pre>
The regular expression `123` matches the string "123". The regular expression is matched against an input string by comparing each
@ -43,7 +43,7 @@ character in the regular expression to each character in the input string, one a
case-sensitive so the regular expression `Cat` would not match the string "cat".
<pre>
"Cat" => The cat sat on the <strong><u>Cat</u></strong>
"Cat" => The cat sat on the <strong><a href="#learn-regex">Cat</a></strong>
</pre>
## 2. Meta Characters
@ -74,7 +74,7 @@ or new line characters. For example the regular expression `.ar` means: any char
letter `r`.
<pre>
".ar" => The <strong><u>car</u></strong> <strong><u>par</u></strong>ked in the <strong><u>gar</u></strong>age.
".ar" => The <strong><a href="#learn-regex">car</a></strong> <strong><a href="#learn-regex">par</a></strong>ked in the <strong><a href="#learn-regex">gar</a></strong>age.
</pre>
## 2.2 Character set
@ -84,13 +84,13 @@ specify the characters range. The order of the character range inside square bra
expression `[Tt]he` means: an uppercase `T` or lowercase `t`, followed by the letter `h`, followed by the letter `e`.
<pre>
"[Tt]he" => <strong><u>The</u></strong> car parked in <strong><u>the</u></strong> garage.
"[Tt]he" => <strong><a href="#learn-regex">The</a></strong> car parked in <strong><a href="#learn-regex">the</a></strong> garage.
</pre>
Just like above example the regular expression `ar[.]` means: an lowercase character `a`, followed by letter `r`, followed by any character.
<pre>
"ar[.]" => The car p<strong><u>ark</u></strong>ed in the g<strong><u>ara</u></strong>ge.
"ar[.]" => The car p<strong><a href="#learn-regex">ark</a></strong>ed in the g<strong><a href="#learn-regex">ara</a></strong>ge.
</pre>
### 2.2.1 Negated character set
@ -100,7 +100,7 @@ character set. For example the regular expression `[^c]ar` means: any character
the letter `r`.
<pre>
"[^c]ar" => The car <strong><u>par</u></strong>ked in the <strong><u>gar</u></strong>age.
"[^c]ar" => The car <strong><a href="#learn-regex">par</a></strong>ked in the <strong><a href="#learn-regex">gar</a></strong>age.
</pre>
@ -116,7 +116,7 @@ of preceding lowercase character `a`. But if it apperas after a character set or
character set. For example the regular expression `[a-z]*` means: any number of lowercase letters in a row.
<pre>
"[a-z]*" => <strong><u>The</u></strong> <strong><u>car</u></strong> <strong><u>parked</u></strong> <strong><u>in</u></strong> <strong><u>the</u></strong> <strong><u>garage</u></strong> #21.
"[a-z]*" => <strong><a href="#learn-regex">The</a></strong> <strong><a href="#learn-regex">car</a></strong> <strong><a href="#learn-regex">parked</a></strong> <strong><a href="#learn-regex">in</a></strong> <strong><a href="#learn-regex">the</a></strong> <strong><a href="#learn-regex">garage</a></strong> #21.
</pre>
The `*` symbol can be used with the meta character `.` to match any string of characters `.*`. The `*` symbol can be used with the
@ -125,7 +125,7 @@ spaces, followed by lowercase character `c`, followed by lowercase character `a`
zero or more spaces.
<pre>
"\s*cat\s*" => The fat<strong><u> cat </u></strong>sat on the <strong><u>cat</u></strong>.
"\s*cat\s*" => The fat<strong><a href="#learn-regex"> cat </a></strong>sat on the <strong><a href="#learn-regex">cat</a></strong>.
</pre>
### 2.3.2 The Plus
@ -134,7 +134,7 @@ The symbol `+` matches one or more repetitions of the preceding character. For e
letter `c`, followed by any number of character, followed by the lowercase character `t`.
<pre>
"c.+t" => The fat <strong><u>cat sat on the mat</u></strong>.
"c.+t" => The fat <strong><a href="#learn-regex">cat sat on the mat</a></strong>.
</pre>
### 2.3.3 The Question Mark
@ -144,9 +144,9 @@ the preceding character. For example the regular expression `[T]?he` means: Opti
character `h`, followed by the lowercase character `e`.
<pre>
"[T]he" => <strong><u>The</u></strong> car is parked in the garage.
"[T]he" => <strong><a href="#learn-regex">The</a></strong> car is parked in the garage.
</pre>
<pre>
"[T]?he" => <strong><u>The</u></strong> car is parked in t<strong><u>he</u></strong> garage.
"[T]?he" => <strong><a href="#learn-regex">The</a></strong> car is parked in t<strong><a href="#learn-regex">he</a></strong> garage.
</pre>