Expected regex syntax to validate Liferay form fields

Issue

Facing invalid error message on form UI while working with the 'Regex Expressions' to validate the fields even though right email id is entered.
- Issue encounters while using the below regex to validate an email field
  - /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/
  - ^[\\w!#$%&’*+/=?`{|}~^-]+(?:\\.[\\w!#$%&’*+/=?`{|}~^-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$
  - ^[a-zA-Z0-9_!#$%&’*+/=?`{|}~^-]+(?:\\.[a-zA-Z0-9_!#$%&’*+/=?`{|}~^-]+)*@[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$

Forms understand a specific format of regex based on Java syntax.
In this context, it is necessary to remove the start and end bars of the regular expression
- Error syntax : /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/
- Working syntax : ^\w+([\.-]?\w+)@\w+([\.-]?\w+)(\.\w{2,3})+$
Avoid extra backslashes before metacharacters for character classes such as \w
- Error syntaxes:
  - ^[\\w!#$%&’*+/=?`{|}~^-]+(?:\\.[\\w!#$%&’*+/=?`{|}~^-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$
  - ^[a-zA-Z0-9_!#$%&’*+/=?`{|}~^-]+(?:\\.[a-zA-Z0-9_!#$%&’*+/=?`{|}~^-]+)*@[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$
- Working syntaxes:
  - ^[\w!#$%&'*+/=?`{|}~^-]+(?:\.[\w!#$%&'*+/=?`{|}~^-]+)*@(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]{2,6}$
  - ^[a-zA-Z0-9_!#$%&’*+/=?`{|}~^-]+(?:\.[a-zA-Z0-9_!#$%&’*+/=?`{|}~^-]+)*@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$