Update TestValidation/Regex_Validation_test_1

[polds]

TestValidation/Regex_Validation_test_1 is broken. We should fix or remove.

=== RUN   TestValidation/Regex_Validation_test_1
    eval_test.go:349: Compile() got error = unexpected token Operator(".") (1:8)
         | 'hello'.matches('el*')
         | .......^, wantErr false
    --- FAIL: TestValidation/Regex_Validation_test_1 (0.00s)