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rephrase text pattern replacement example

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The example **Replace all occurrences of one text pattern with another pattern** mentions a "British English date pattern" when it's using ISO 8601 dates, see issue #386. Change the explanation and a variable name. Also use the same string in code that's in the explanation Untested, sorry.
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src/basics.md
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@ -825,8 +825,8 @@ fn main() {
[![regex-badge]][regex] [![lazy_static-badge]][lazy_static] [![cat-text-processing-badge]][cat-text-processing]
Replaces all occurrences of the hyphenated British English date pattern `2013-01-15`
with its equivalent slashed American English date pattern `01/15/2013`.
Replaces all occurrences of the standard ISO 8601 *YYYY-MM-DD* date pattern
with the equivalent American English date with slashes; for example `2013-01-15` becomes `01/15/2013`.
The method [`Regex::replace_all`] replaces all occurrences of the whole regex. The
`Replacer` trait helps to figure out the replacement string. This trait is implemented
@ -844,17 +844,17 @@ use regex::Regex;
fn reformat_dates(before: &str) -> Cow<str> {
lazy_static! {
static ref ENGL_DATE_REGEX : Regex = Regex::new(
static ref ISO8601_DATE_REGEX : Regex = Regex::new(
r"(?P<y>\d{4})-(?P<m>\d{2})-(?P<d>\d{2})"
).unwrap();
}
ENGL_DATE_REGEX.replace_all(before, "$m/$d/$y")
ISO8601_DATE_REGEX.replace_all(before, "$m/$d/$y")
}
fn main() {
let before = "2012-03-14, 2013-01-01 and 2014-07-05";
let before = "2012-03-14, 2013-01-15 and 2014-07-05";
let after = reformat_dates(before);
assert_eq!(after, "03/14/2012, 01/01/2013 and 07/05/2014");
assert_eq!(after, "03/14/2012, 01/15/2013 and 07/05/2014");
}
```