Regular Expressions 101

Negative Lookbehind(?<!\\)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Group start(?P<start>```)

```the literal text ```

Positive Lookbehind(?<=```)

```the literal text ```

Non-Capturing Group(?:(?P<lang>[a-z][a-z0-9]*)\s)?

?repeats the group contents below at most once:

Group lang(?P<lang>[a-z][a-z0-9]*)

Character Class[a-z]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Character Class[a-z0-9]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\sany whitespace character

Group content(?P<content>.*?)

.*?any character, repeated any number of times

Negative Lookbehind(?<!\\)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Positive Lookahead(?=```)

```the literal text ```

Group end(?P<end>(?:\\\\)*```)

Non-Capturing Group(?:\\\\)*

*repeats the group contents below any number of times:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

```the literal text ```

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

s modifier: single line. Allows a dot to match line terminators

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<!\\)(?P<start>```)(?<=```)(?:(?P<lang>[a-z][a-z0-9]*)\s)?(?P<content>.*?)(?<!\\)(?=```)(?P<end>(?:\\\\)*```)

New

```php
$foo = 'Bar';
define('FOO', 'BAR');
```

```$foo = 'Bar';```Foobarbaz
Foobarbaz```$foo = 'Bar';```

/(?P<start>\```)(?<=\```)(?P<lang>[a-z][a-z0-9]*\s)?(?P<content>.*?)(?=\```)(?P<end>\```)/gs

(?<!\\)(?P<start>```)(?<=```)(?P<lang>[a-z][a-z0-9]*\s)?(?P<content>.*?)(?<!\\)(?=```php )(?P<end>(?:\\\\)*```)