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minor#10671 Update custom_constraint.rst (thomasbisignani)

This PR was submitted for the 4.1 branch but it was merged into the 2.8 branch instead (closes#10671).Discussion----------Update custom_constraint.rstJust added the constraint check to limit the `ContainsAlphanumericValidator` use with the `ContainsAlphanumeric` constraint.Commits-------bb30126 Update custom_constraint.rst

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Original file line number	Diff line number	Diff line change
@@ -65,6 +65,10 @@ The validator class is also simple, and only has one required method ``validate(
`65`	`65`	`{`
`66`	`66`	`public function validate($value, Constraint $constraint)`
`67`	`67`	`{`
	`68`	`+ if (!$constraint instanceof ContainsAlphanumeric) {`
	`69`	`+ throw new UnexpectedTypeException($constraint, ContainsAlphanumeric::class);`
	`70`	`+ }`
	`71`	`+`
`68`	`72`	`// custom constraints should ignore null and empty values to allow`
`69`	`73`	`// other constraints (NotBlank, NotNull, etc.) take care of that`
`70`	`74`	`if (null === $value \|\| '' === $value) {`

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`‎validation/custom_constraint.rst‎`

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