Function parse_variable 

pub fn parse_variable(input: Span<'_>) -> IResult<Span<'_>, Span<'_>>

Parse a template placeholder variable. This is a £ followed by a variable name.

Examples

Variables must start with a £.

use blogs_md_easy::{parse_variable, Span};

let input = Span::new("£variable");
let (_, variable) = parse_variable(input).unwrap();
assert_eq!(variable.fragment(), &"variable");

In keeping with what people are used to, it is also possible to use a $.

use blogs_md_easy::{parse_variable, Span};

let input = Span::new("$variable");
let (_, variable) = parse_variable(input).unwrap();
assert_eq!(variable.fragment(), &"variable");

Failing to start with a £ will return an error.

use blogs_md_easy::{parse_variable, Span};

let input = Span::new("variable");
let variable = parse_variable(input);
assert!(variable.is_err());