Like in JavaScript (EcmaScript), let use regular expressions embebbed into de Vala language, with own syntaxm, and not like strings:

Considering an example:

RegularExpression reg = new RegularExpression("{\\d}*[a-zA-Z0-9]{2, 10}", RegularExpressionOption.Global || RegularExpressionOption.InsensitiveCase);

With javascript like syntax:

RegularExpression reg = /{\d}*[a-zA-Z0-9]{2, 10}/gi;