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Regular Expressions (regex for short) is what is used. See page 13 in the install guide (v2.0).
For help about regex see the recommended web site as mentioned in the guide: Regular-Expressions.info - Regex Tutorial, Examples and Reference - Regexp Patterns
Is it necessary to give a regex for parameter ?
can't we pass the value, as I did ?
No, the pattern is always considered a regex. It's not that hard, really. In your case the values are:
in other words, they just need the period characters escaped.