Example 2 in `add` command does not work

[nus-pe-script]

Describe the bug The example command add n/Betsy Crowe t/same office e/betsycrowe@microhard.com a/Microhard p/1234567 r/CEO t/boss does not work. Displayed tag name should be alphanumeric (optional).

To Reproduce Steps to reproduce the behavior:

1. Enter add n/Betsy Crowe t/same office e/betsycrowe@microhard.com a/Microhard p/1234567 r/CEO t/boss
2. See Error

Expected behavior Entry should be added.

Screenshots

OS and Java Version macOS 10.14.1 , JDK 9

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_{[original: dummy#23]}