StringExtension extension

Null-safe validation, parsing, formatting, and conversion helpers for strings.

on

Properties

date → DateTime?

Available on String?, provided by the StringExtension extension

Returns DateTime if string is a date string like "2025-01-01 12:00:00"
no setter
dateOnly → DateTime?

Available on String?, provided by the StringExtension extension

Returns DateTime if string is a date string like "2025-01-01"
no setter
ipv4Tov6 → String?

Available on String?, provided by the StringExtension extension

Convert an IPv4 address to an IPv6 address,
no setter
ipv6Tov4 → String?

Available on String?, provided by the StringExtension extension

Convert an IPv6 address to an IPv4 address,
no setter
isBlank → bool

Available on String?, provided by the StringExtension extension

Returns true if string is null, empty, or only whitespace.
no setter
isChineseFullName → bool

Available on String?, provided by the StringExtension extension

Returns true if name is a valid Chinese full name.
no setter
isChineseIdNumber → bool

Available on String?, provided by the StringExtension extension

Returns true if this string is a valid Chinese resident ID number.
no setter
isCreditCard → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid credit card number
no setter
isDate → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a date
no setter
isDEANumberOfUS → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid US Drug Enforcement Agency
no setter
isEmail → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid email address
no setter
isEmpty → bool

Available on String?, provided by the StringExtension extension

Returns true if string is null or empty
no setter
isIPAddress → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid IPv4 or IPv6 address
no setter
isIPv4 → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid IPv4 address
no setter
isIPv6 → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid IPv6 address
no setter
isJson → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid JSON string
no setter
isNotBlank → bool

Available on String?, provided by the StringExtension extension

Returns true if string has at least one non-whitespace character.
no setter
isNotEmpty → bool

Available on String?, provided by the StringExtension extension

Returns true if string is not empty
no setter
isNumeric → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid number
no setter
isPhoneNumberOfUS → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid US Phone Number
no setter
isQuery → bool

Available on String?, provided by the StringExtension extension

Validates URL query string (handles ? & # fragments, allows empty values)
no setter
isSSNofUS → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid US Society Security Number
no setter
isStrongPassword → bool

Available on String?, provided by the StringExtension extension

Returns true if string match strong password requirements
no setter
isTime → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a time
no setter
isUrl → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a valid url
no setter
nullIfBlank → String?

Available on String?, provided by the StringExtension extension

Returns null when this string is null, empty, or only whitespace.
no setter
orEmpty → String

Available on String?, provided by the StringExtension extension

Returns this string, or an empty string when it is null.
no setter
time → Time?

Available on String?, provided by the StringExtension extension

Returns Time if string is a time string like "12:00:00"
no setter
timeOnly → Time?

Available on String?, provided by the StringExtension extension

Returns Time if string is a time string like "12:00:00"
no setter
trimmed → String

Available on String?, provided by the StringExtension extension

Returns a trimmed string, or an empty string when it is null.
no setter

Methods

bytes() → List<int>

Available on String?, provided by the StringExtension extension

Returns a list of the UTF-16 code units of the string.
bytesChunks(int chunkSize) → List<List<int>>

Available on String?, provided by the StringExtension extension

Splits the string's UTF-16 code units (bytes) into a list of chunks.
bytesCount() → int

Available on String?, provided by the StringExtension extension

Calculates the byte count of a string, treating non-ASCII characters as 2 bytes.
capitalize({bool allWords = false}) → String

Available on String?, provided by the StringExtension extension

Returns string with capitalized first letter.
chunks(int chunkSize) → List<String>

Available on String?, provided by the StringExtension extension

Splits the string into a list of chunks of a specified size.
containsIgnoreCase(String other) → bool

Available on String?, provided by the StringExtension extension

Returns true if this string contains other, ignoring letter case.
isValidFileExtension([List<String>? allowed]) → bool

Available on String?, provided by the StringExtension extension

Returns true if string is a file
json() → dynamic

Available on String?, provided by the StringExtension extension

Returns JSON object if string is a valid JSON string
limit(int maxLength, {String ellipsis = '...'}) → String

Available on String?, provided by the StringExtension extension

Limits this string to maxLength and appends ellipsis when truncated.
mask({int start = 0, int? end, String mask = '*'}) → String

Available on String?, provided by the StringExtension extension

Masks the characters from start to end with mask.
numeric() → num?

Available on String?, provided by the StringExtension extension

Returns double 0.564 from string percentage like "56.4%" Parses this string as a double literal and returns its value.
onlyDigits() → String

Available on String?, provided by the StringExtension extension

Returns only the numeric digits from this string.
removeWhitespace() → String

Available on String?, provided by the StringExtension extension

Returns a copy of this string with all whitespace removed.
reverse() → String

Available on String?, provided by the StringExtension extension

Returns this string reversed by rune.
toCamelCase() → String

Available on String?, provided by the StringExtension extension

Converts a string from snake_case or kebab-case to camelCase.
toSnakeCase({String separator = '_'}) → String

Available on String?, provided by the StringExtension extension

Converts a string from camelCase to snake_case.