Current state
Currently, the String generator allows to specify the length of the string and the string contents by character categories:
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Letters – By default, this check box is selected.
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Digits – By default, this check box is selected.
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Spaces – By default, this check box is selected.
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Punctuation marks – By default, this check box is selected.
The docs are here https://support.smartbear.com/readyapi/docs/testing/data-driven/types/generator/string.html .
Proposal
However, there are cases which need more precise string format. Regular expression would allow an elegant way to define the format.
I suggest to add an option to set a regular expression pattern. The String generator would follow the regex pattern instead of string length and the above mentioned character categories.