Table of Contents

About

regexp is a data supplier that generates data based on a regular expression.

Example

Example

Generation of a decimal that has:

  • 3 digits in the integral part
  • 3 digits in the fractional part

thanks to the regular expression [0-9]{3}\.[0-9]{3} 

columns:
  - name: regexp_double
    type: Double
    precision: 6
    scale: 3
    data-supplier:
      type: regexp
      arguments:
        expression: '[0-9]{3}\.[0-9]{3}'
        # an optional seed to get deterministic value between execution
        seed: 1234L

Arguments

Expression

expression is a regular expression that defines the pattern of the data that should be generated.

The following table shows the supported syntax:

Pattern Description
. Any symbol. See below details - Dot pattern generated symbols section.
? One or zero occurrences
+ One or more occurrences
* Zero or more occurrences
\r Carriage return CR character
\t Tab character
\n Line feed LF character.
\d A digit. Equivalent to [0-9]
\D Not a digit. Equivalent to [^0-9]
\s Configurable. By default: Space or Tab. See WHITESPACE_DEFINITION property.
\S Anything, but Carriage Return, Space, Tab, Newline, Vertical Tab, Form Feed
\w Any word character. Equivalent to [a-zA-Z0-9_]
\W Anything but a word character. Equivalent to [^a-zA-Z0-9_]
\i Places same value as capture group with index i. i is any integer number.
\Q and \E Any characters between \Q and \E, including metacharacters, will be treated as literals.
\b and \B These characters are ignored. No validation is performed!
\xXX and \x{XXXX} Hexadecimal value of unicode characters 2 or 4 hexadecimal digits
\uXXXX Hexadecimal value of unicode characters 4 hexadecimal digits
\p{...} Any character in class. See details below before use.
\P{...} Any character not in class. See details below before use.
{a} and {a,b} Repeat a; or min a max b times. Use {n,} to repeat at least n times.
[...] Single character from ones that are inside brackets. [a-zA-Z] (dash) also supported
[^...] Single character except the ones in brackets. [^a] - any symbol except 'a'
() To group multiple characters for the repetitions
\\ Escape character (use \\\\ (double backslash) to generate single %\% character)

Seed

seed is optional. It's a start point in the generation of pseudo-random numbers.

If set the data will be deterministic between executions.

Limitations

Limitations and syntax information can be found on the RxGen Library