string_validator

Description:

string validator

string_validator
=============
String validation and sanitization for Dart.
This is a new fork of validator.dart, which was originally a port of validator.js.
Validators #

equals(String str, comparison) - check if the string matches the comparison.
contains(String str, seed) - check if the string contains the seed.
matches(String str, pattern) - check if string matches the pattern. matches('foobar', 'foo').
isEmail(String str) - check if the string is an email.
isURL(String str [, options]) - check if the string is an URL. options is an object which defaults to { protocols: ['http','https','ftp'], require_tld: true, require_protocol: false, allow_underscores: false }.
isFQDN(String str [, options]) - check if the string is a fully qualified domain name (e.g. domain.com). options is an object which defaults to { require_tld: true, allow_underscores: false }.
isIP(String str [, version]) - check if the string is an IP (version 4 or 6).
isAlpha(String str) - check if the string contains only letters (a-zA-Z).
isNumeric(String str) - check if the string contains only numbers.
isAlphanumeric(String str) - check if the string contains only letters and numbers.
isBase64(String str) - check if a string is base64 encoded.
isHexadecimal(String str) - check if the string is a hexadecimal number.
isHexColor(String str) - check if the string is a hexadecimal color.
isLowercase(String str) - check if the string is lowercase.
isUppercase(String str) - check if the string is uppercase.
isInt(String str) - check if the string is an integer.
isFloat(String str) - check if the string is a float.
isDivisibleBy(String str, number) - check if the string is a number that's divisible by another.
isLength(String str, min [, max]) - check if the string's length falls in a range. Note: this function takes into account surrogate pairs.
isByteLength(String str, min [, max]) - check if the string's length (in bytes) falls in a range.
isUUID(String str [, version]) - check if the string is a UUID (version 3, 4 or 5).
isDate(String str) - check if the string is a date.
isAfter(String str [, date]) - check if the string is a date that's after the specified date (defaults to now).
isBefore(String str [, date]) - check if the string is a date that's before the specified date.
isIn(String str, values) - check if the string is in a array of allowed values.
isCreditCard(String str) - check if the string is a credit card.
isISBN(String str [, version]) - check if the string is an ISBN (version 10 or 13).
isJSON(String str) - check if the string is valid JSON (note: uses JSON.parse).
isMultibyte(String str) - check if the string contains one or more multibyte chars.
isAscii(String str) - check if the string contains ASCII chars only.
isFullWidth(String str) - check if the string contains any full-width chars.
isHalfWidth(String str) - check if the string contains any half-width chars.
isVariableWidth(String str) - check if the string contains a mixture of full and half-width chars.
isSurrogatePair(String str) - check if the string contains any surrogate pairs chars.
isMongoId(String str) - check if the string is a valid hex-encoded representation of a [MongoDB ObjectId][mongoid].

Sanitizers #

toString(String input) - convert the input to a string.
toDate(String input) - convert the input to a date, or null if the input is not a date.
toFloat(String input) - convert the input to a float, or NaN if the input is not a float.
toInt(String input [, radix]) - convert the input to an integer, or NaN if the input is not an integer.
toBoolean(String input [, strict]) - convert the input to a boolean. Everything except for '0', 'false' and '' returns true. In strict mode only '1' and 'true' return true.
trim(String input [, chars]) - trim characters (whitespace by default) from both sides of the input.
ltrim(String input [, chars]) - trim characters from the left-side of the input.
rtrim(String input [, chars]) - trim characters from the right-side of the input.
escape(String input) - replace <, >, &, ' and " with HTML entities.
stripLow(String input [, keep_new_lines]) - remove characters with a numerical value < 32 and 127, mostly control characters. If keep_new_lines is true, newline characters are preserved (\n and \r, hex 0xA and 0xD). Unicode-safe in JavaScript.
whitelist(String input, chars) - remove characters that do not appear in the whitelist. The characters are used in a RegExp and so you will need to escape some chars, e.g. whitelist(String input, '\[\]').
blacklist(String input, chars) - remove characters that appear in the blacklist. The characters are used in a RegExp and so you will need to escape some chars, e.g. blacklist(String input, '\[\]').
normalizeEmail(String email [, options]) - canonicalize an email address. options is an object which defaults to { lowercase: true }. With lowercase set to true, the local part of the email address is lowercased for all domains; the hostname is always lowercased and the local part of the email address is always lowercased for hosts that are known to be case-insensitive (currently only GMail). Normalization follows special rules for known providers: currently, GMail addresses have dots removed in the local part and are stripped of tags (e.g. [email protected] becomes [email protected]) and all @googlemail.com addresses are normalized to @gmail.com.

Extension Methods #
To make using these validators and sanitizers more convenient, this package includes extension methods for each function. These methods can be called directly on a string instance, making the code more concise and readable.
Example Usage #
Here are some examples of how to use the extension methods:
import 'package:string_validator/string_validator.dart';

void main() {
// Using Validator Extensions
String email = '[email protected]';
bool isEmailValid = email.isEmail;

String url = 'https://example.com';
bool isUrlValid = url.isURL();

String ip = '192.168.0.1';
bool isIpValid = ip.isIP();

String alpha = 'abc';
bool isAlphaValid = alpha.isAlpha;

String numeric = '123';
bool isNumericValid = numeric.isNumeric;

String alphanumeric = 'abc123';
bool isAlphanumericValid = alphanumeric.isAlphanumeric;

String base64 = 'aGVsbG8gd29ybGQ=';
bool isBase64Valid = base64.isBase64;

String integer = '12345';
bool isIntValid = integer.isInt;

String float = '123.45';
bool isFloatValid = float.isFloat;

String hex = '1f';
bool isHexValid = hex.isHexadecimal;

String hexColor = '#ff0000';
bool isHexColorValid = hexColor.isHexColor;

String lower = 'hello';
bool isLowerValid = lower.isLowercase;

String upper = 'HELLO';
bool isUpperValid = upper.isUppercase;

String divisible = '10';
bool isDivisibleValid = divisible.isDivisibleBy(2);

String length = 'hello';
bool isLengthValid = length.isLength(3, 6);

String byteLength = 'hello';
bool isByteLengthValid = byteLength.isByteLength(3, 10);

String uuid = '550e8400-e29b-41d4-a716-446655440000';
bool isUuidValid = uuid.isUUID();

String date = '2023-05-17';
bool isDateValid = date.isDate;

String afterDate = '2024-01-01';
bool isAfterValid = afterDate.isAfter('2023-12-31');

String beforeDate = '2023-01-01';
bool isBeforeValid = beforeDate.isBefore('2024-01-01');

String inList = 'apple';
bool isInValid = inList.isIn(['apple', 'banana', 'cherry']);

String creditCard = '4111111111111111';
bool isCreditCardValid = creditCard.isCreditCard;

String isbn = '978-3-16-148410-0';
bool isIsbnValid = isbn.isISBN();

String json = '{"name": "John"}';
bool isJsonValid = json.isJson;

String multibyte = '你好';
bool isMultibyteValid = multibyte.isMultibyte;

String ascii = 'Hello';
bool isAsciiValid = ascii.isAscii;

String fullWidth = 'Ｈｅｌｌｏ';
bool isFullWidthValid = fullWidth.isFullWidth;

String halfWidth = 'Hello';
bool isHalfWidthValid = halfWidth.isHalfWidth;

String variableWidth = 'Ｈｅllo';
bool isVariableWidthValid = variableWidth.isVariableWidth;

String surrogatePair = '𐍈';
bool isSurrogatePairValid = surrogatePair.isSurrogatePair;

String mongoId = '507f1f77bcf86cd799439011';
bool isMongoIdValid = mongoId.isMongoId;

// Using Sanitizer Extensions
String dateStr = '2024-05-18';
DateTime? parsedDate = dateStr.toDate();

String floatStr = '123.45';
double parsedFloat = floatStr.toFloat();

String intStr = '123';
int parsedInt = intStr.toInt();

String boolStr = 'true';
bool parsedBool = boolStr.toBoolean();

String trimStr = ' hello world ';
String trimmedStr = trimStr.trim();

String ltrimStr = ' hello';
String ltrimmedStr = ltrimStr.ltrim();

String rtrimStr = 'hello ';
String rtrimmedStr = rtrimStr.rtrim();

String whitelistStr = 'abcdef';
String whitelistedStr = whitelistStr.whitelist('abc');

String blacklistStr = 'abcdef';
String blacklistedStr = blacklistStr.blacklist('abc');

String stripLowStr = 'hello\u0000world';
String strippedLowStr = stripLowStr.stripLow();

String escapeStr = '<div>"Hello"&</div>';
String escapedStr = escapeStr.escape();

String normalizeEmailStr = '[email protected]';
String normalizedEmail = normalizeEmailStr.normalizeEmail();
}
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