A Java library for repeatable generating strings at random from a regular grammar. Regxlar is based on the library http://www.brics.dk/~amoeller/automaton/.
- Apache Maven 3
- Java >= 1.7
git clone https://github.com/umaqsud/regxlar.git
cd regxlar
mvn clean package
Regxlar is now installed in regxlar/target
Let's take a simple regular expression for email addresses: [a-z0-9]{5,10}\\.[a-zA-Z0-9]{5,10}\\@[a-z0-9]{5,10}\\.[a-z]{2,4}. Using Regxlar you can now generate strings matching this regular expression. If you need generate repeatable strings you can use a seeded random number generator.
Regxlar regxlar = new Regxlar("[a-z0-9]{5,10}\\.[a-zA-Z0-9]{5,10}\\@[a-z0-9]{5,10}\\.[a-z]{2,4}");
// Generate string at random
String random = regxlar.generateNext();
System.out.println(random);
// it prints e.g. 0xl8k.xi0q7a@6xo0fc8ut8.adgp
// Generate repeatable string using a seeded random number generator
double seed = 0.5;
String random1 = regxlar.generateNext(new SeedRandomGenerator(seed));
String random2 = regxlar.generateNext(new SeedRandomGenerator(seed));
System.out.println(random1);
System.out.println(random2);
System.out.println(random1.equals(random2));
// it prints
// a80w2n.WC92MB3@bil03i2hs.pnqy
// a80w2n.WC92MB3@bil03i2hs.pnqy
// true- generates strings at random matching a regular expression
- generates repeatable strings using a seeded random number generator
Regxlar does not support all valid regular expressions. Future versions might support further regular expression syntaxes. Regular expressions are built from the following abstract syntax:
regexp ::= unionexp
|
unionexp ::= interexp | unionexp (union)
| interexp
interexp ::= concatexp & interexp (intersection) [OPTIONAL]
| concatexp
concatexp ::= repeatexp concatexp (concatenation)
| repeatexp
repeatexp ::= repeatexp ? (zero or one occurrence)
| repeatexp * (zero or more occurrences)
| repeatexp + (one or more occurrences)
| repeatexp {n} (n occurrences)
| repeatexp {n,} (n or more occurrences)
| repeatexp {n,m} (n to m occurrences, including both)
| complexp
complexp ::= ~ complexp (complement) [OPTIONAL]
| charclassexp
charclassexp ::= [ charclasses ] (character class)
| [^ charclasses ] (negated character class)
| simpleexp
charclasses ::= charclass charclasses
| charclass
charclass ::= charexp - charexp (character range, including end-points)
| charexp
simpleexp ::= charexp
| . (any single character)
| # (the empty language) [OPTIONAL]
| @ (any string) [OPTIONAL]
| " <Unicode string without double-quotes> " (a string)
| ( ) (the empty string)
| ( unionexp ) (precedence override)
| < <identifier> > (named automaton) [OPTIONAL]
| <n-m> (numerical interval) [OPTIONAL]
charexp ::= <Unicode character> (a single non-reserved character)
| \ <Unicode character> (a single character)
For further information about this syntax consider this documentation: http://www.brics.dk/automaton/doc/index.html?dk/brics/automaton/Automaton.html.
Regxlar is licensed under the Apache Software License Version 2.0. For more information please consult the LICENSE file.