Laravel 5.4 - Validation with Regex [duplicate]
Your rule is well done BUT you need to know, specify validation rules with regex separated by pipeline can lead to undesired behavior.
The proper way to define a validation rule should be:
$this->validate(request(), [ 'projectName' => array( 'required', 'regex:/(^([a-zA-Z]+)(\d+)?$)/u' )];You can read on the official docs:
regex:pattern
The field under validation must match the given regular expression.
Note: When using the regex / not_regex patterns, it may be necessary to specify rules in an array instead of using pipe delimiters, especially if the regular expression contains a pipe character.