Regular expressions
/[a-z](?<![aeiou])[aeiou]/gi (any consonant-vowel pair)Regular expression, often shorted to regex, is a standard
Syntax
x, y, and z when used under symbols are placeholders for text. Capital Xs, Ys, and Zs are used for number placeholders.
| Symbol(s) | Name | Description | Example |
|---|---|---|---|
| Groups and backreferences | |||
(x) |
Capture group | Separates the content in the output. | "Foo Bar" /(Foo)|(Bar)/g -> [ "Foo", "Bar" ]
|
(?:x) |
Non-capture group | Acts as if the parentheses were not there | "Foo Bar" /(?:Foo)|(?:Bar)/g -> [ "Foo Bar" ]
|
(?<y>x) |
Named capture group | Equivalent to (x), except it remembers the content used. |
"Foo Bar" /(?<F>Foo)|(?<B>Bar)/g -> [ "Foo", "Bar" ]
|
\k<y> |
Named backreference | References a previous named capture group | "Foo Foo" /(?<Foo>Foo)\s\k<Foo>/g -> [ "Foo Foo" ]
|
Flags
| Flag | Name | Description |
|---|---|---|
g |
global |
Search all of a string, rather than stopping once you find an occurrence. |