MentionSyntax constructor
MentionSyntax({})
Implementation
MentionSyntax(
{required this.startingCharacter,
required this.missingText,
this.prefix = '<###',
this.suffix = '###>',
this.pattern = "[a-zA-Z0-9]{1,}"}) {
_mentionRegex = RegExp('($prefix)($startingCharacter)($pattern)($suffix)');
}