Struct RegexField 

pub struct RegexField {
    pub name: String,
    pub label: Option<String>,
    pub required: bool,
    pub help_text: Option<String>,
    pub widget: Widget,
    pub initial: Option<Value>,
    pub error_message: String,
    pub max_length: Option<usize>,
    pub min_length: Option<usize>,
    /* private fields */
}

RegexField for pattern-based validation

Compiled regex is cached using OnceLock to avoid repeated compilation which could lead to ReDoS via allocation overhead.

Fields

name: String

The field name used as the form data key.

label: Option<String>

Optional human-readable label for display.

required: bool

Whether this field must be filled in.

help_text: Option<String>

Optional help text displayed alongside the field.

widget: Widget

The widget type used for rendering this field.

initial: Option<Value>

Optional initial (default) value for the field.

error_message: String

The error message shown when the regex does not match.

max_length: Option<usize>

Maximum allowed character count.

min_length: Option<usize>

Minimum required character count.

Implementations

impl RegexField

pub fn new(name: String, pattern: &str) -> Result<Self, Error>

Create a new RegexField

The regex is compiled lazily on first use and cached for subsequent calls.

Examples

use reinhardt_forms::fields::RegexField;

let field = RegexField::new("pattern".to_string(), r"^\d+$").unwrap();
assert_eq!(field.name, "pattern");

pub fn with_error_message(self, message: String) -> Self

Overrides the default error message for validation failures.

Trait Implementations

impl Clone for RegexField

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RegexField

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl FormField for RegexField

fn name(&self) -> &str

Returns the field’s name used as the form data key.

fn label(&self) -> Option<&str>

Returns the human-readable label, if set.

fn required(&self) -> bool

Returns whether this field must have a non-empty value.

fn help_text(&self) -> Option<&str>

Returns optional help text displayed alongside the field.

fn widget(&self) -> &Widget

Returns the widget type used for HTML rendering.

fn initial(&self) -> Option<&Value>

Returns the initial (default) value for this field, if any.

fn clean(&self, value: Option<&Value>) -> FieldResult<Value>

Validates and cleans the submitted value, returning the cleaned result.

fn has_changed(&self, initial: Option<&Value>, data: Option<&Value>) -> bool

Check if the field value has changed from its initial value

fn error_messages(&self) -> HashMap<ErrorType, String>

Get custom error messages for this field