StringExtensions extension

Extensions on String for validation and transformation.

on

• String

Methods

after(String delimiter) → String

Available on String, provided by the StringExtensions extension

Part after the first occurrence of delimiter, or the whole string if absent.

before(String delimiter) → String

Available on String, provided by the StringExtensions extension

Part before the first occurrence of delimiter, or the whole string if absent.

between(String start, String end) → String?

Available on String, provided by the StringExtensions extension

Text between start and end, or null if markers are missing or out of order.

capitalize() → String

Available on String, provided by the StringExtensions extension

Capitalizes the first letter of the string.

collapseWhitespace() → String

Available on String, provided by the StringExtensions extension

Replaces runs of whitespace with a single space, trimming ends.

containsDigit() → bool

Available on String, provided by the StringExtensions extension

Checks if the string contains at least one digit.

containsLowercase() → bool

Available on String, provided by the StringExtensions extension

Checks if the string contains at least one lowercase letter.

containsSpecialCharacter() → bool

Available on String, provided by the StringExtensions extension

Whether the string contains at least one non-alphanumeric character.

containsUppercase() → bool

Available on String, provided by the StringExtensions extension

Checks if the string contains at least one uppercase letter.

countOccurrences(String pattern) → int

Available on String, provided by the StringExtensions extension

Number of (non-overlapping) occurrences of pattern.

initials({int max = 2}) → String

Available on String, provided by the StringExtensions extension

Uppercase initial letters (up to max words), useful for avatars.

isAlphabetic() → bool

Available on String, provided by the StringExtensions extension

Checks if the string contains only alphabetic characters.

isAlphanumeric() → bool

Available on String, provided by the StringExtensions extension

Whether the string contains only letters and digits.

isEmail() → bool

Available on String, provided by the StringExtensions extension

Checks if the string is a valid email.

isJson() → bool

Available on String, provided by the StringExtensions extension

Whether the string is valid JSON (object or array).

isNullOrWhiteSpace() → bool

Available on String, provided by the StringExtensions extension

Returns true if the string is null, empty, or contains only whitespace.

isNumeric() → bool

Available on String, provided by the StringExtensions extension

Returns true if the string contains only numeric characters.

isPhoneNumber() → bool

Available on String, provided by the StringExtensions extension

Checks if the string is a valid phone number (basic check).

isStrongPassword({int minLength = 8, bool requireUppercase = true, bool requireLowercase = true, bool requireDigit = true, bool requireSpecial = true}) → bool

Available on String, provided by the StringExtensions extension

Whether the string meets common password strength rules.

isUrl() → bool

Available on String, provided by the StringExtensions extension

Checks if the string is a valid URL.

masked({int visibleCount = 4, String mask = '*'}) → String

Available on String, provided by the StringExtensions extension

Masks all but the last visibleCount characters.

onlyDigits() → String

Available on String, provided by the StringExtensions extension

Keeps only digit characters.

removeWhitespace() → String

Available on String, provided by the StringExtensions extension

Removes all whitespace from the string.

replaceLast(String from, String to) → String

Available on String, provided by the StringExtensions extension

Replaces the last occurrence of from with to.

reverse() → String

Available on String, provided by the StringExtensions extension

Returns a reversed version of the string.

slugify() → String

Available on String, provided by the StringExtensions extension

Lowercases, collapses whitespace and non-alphanumerics into single hyphens.

toBool() → bool?

Available on String, provided by the StringExtensions extension

Parses boolean-ish strings: true/yes/1/y -> true, false/no/0/n -> false, otherwise null.

toCamelCase() → String

Available on String, provided by the StringExtensions extension

Converts to camelCase.

toDoubleSafe() → double?

Available on String, provided by the StringExtensions extension

Parses as double, or null if not a valid number.

toIntSafe() → int?

Available on String, provided by the StringExtensions extension

Parses as int, or null if not a valid integer.

toKebabCase() → String

Available on String, provided by the StringExtensions extension

Converts to kebab-case.

toPascalCase() → String

Available on String, provided by the StringExtensions extension

Converts to PascalCase (Title Case without spaces).

toSnakeCase() → String

Available on String, provided by the StringExtensions extension

Converts to snake_case.

toTitleCase() → String

Available on String, provided by the StringExtensions extension

Converts the string to Title Case (whitespace-separated words).

truncate(int maxLength, {String ellipsis = '...'}) → String

Available on String, provided by the StringExtensions extension

Shortens the string to a specified length with an optional ellipsis.

withoutDigits() → String

Available on String, provided by the StringExtensions extension

Removes all digit characters.