LanguageValues and typesStandard typesSoftware
RegularExpression
On this page
A pattern for matching text: [A-Z]{2}[0-9]{2}.
Use it when a person sets a pattern while your app runs. A type's own pattern: is checked when you compile, and suits a fixed rule better.
Shape
One value, held as text in one set form, with no parts: \p{Lu}\w*.
Example
RegularExpression("[A-Z]{2}[0-9]{2}")RegularExpression(raw) checks the text, and text that isn't one breaks the format rule.
text.parse(raw, as: RegularExpression) reads one from text that comes from outside. Text that isn't one at all fails malformed, such as (a+)\1, (?<name>a)\k<name> or foo(?=bar).
Good to know
- Backreferences such as
\1are refused, which keeps every pattern quick to run. ==tells you whether two are the same.<andlist.sort_bydon't take it.
In JSON
A string, in a request, a response or json.write:
"[A-Z]{2}[0-9]{2}""(?i)grey|gray""\\p{Lu}\\w*"
Details
Text form, storage, how it is shown, and operations
RegularExpression is in the group Software, and has been in Jadpo since 0.1.0.
Text form
text.from writes one standard text form, the same form text.parse reads back: [A-Z]{2}[0-9]{2}, (?i)grey\|gray and \p{Lu}\w*.
How it is stored
It is stored in one column named for the field, of type text. (?i)grey\|gray is stored as '(?i)grey\|gray'.
How it is shown to people
text.format(value, locale:) shows it to people in their locale.
With locale: Locale.en_gb:
| Value | Shown |
|---|---|
[A-Z]{2}[0-9]{2} |
[A-Z]{2}[0-9]{2} |
(?i)grey|gray |
(?i)grey|gray |
\p{Lu}\w* |
\p{Lu}\w* |
Operations
It also takes text.parse, text.from, text.format, json.read, json.write and ==. How every standard type behaves says how they work.
Markdown for agents: /docs/types/type-regular-expression.md.Built from Jadpo main at aee2e8f.