Can't save matrix entry where name begins with number

[thekanbo]

Describe the issue

When creating a new entry, the entry save action will be rejected with the message "The given data was invalid.", errors: {name: ["The name format is invalid."]}}

To reproduce

• Create a new collection type, with or without an attached fieldset
• Create and save a new entry, where the first character in the name is a number

Expected behavior

Entry should be allowed to save

Screenshots

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Bug report checklist

• I have filled out as much information as I can
• I have detailed how the issue can be reproduced
• I have searched for existing issues and to the best of my knowledge this is not a duplicate