How to override Parser.php ?

[alexvam1]

Hi!

I need to change /crm/application/Espo/Core/Formula/Parser.php

private string $attributeNameRegExp = "/^[a-zA-Z0-9.]+$/";

to:

private string $attributeNameRegExp = "/^[a-zA-Z0-9._]+$/";

How can i make this change to /crm/application/Espo/Core/Formula/Parser.php by the "upgrade safe" way, not editing /crm/application/ folder.

Making custom file at /crm/custom/Espo/Core/Formula/Parser.php not working.

[emillod]

You can create your own in custom directory and use it instead of default.

[alexvam1]

You can create your own in custom directory and use it instead of default.

Thanks!
How to use my own parser instead of default for whole espoCRM code?!

[emillod]

You have to implement it as a new formula
Formula functions - EspoCRM Documentation

[alexvam1]

You have to implement it as a new formula
Formula functions - EspoCRM Documentation

No

I need to add symbol _ to formula script parser.