Showing content from https://www.playframework.com/documentation/2.5.x/api/scala/play/api/libs/json/ConstraintReads.html below:
ConstraintReads - play.api.libs.json.ConstraintReads
final def !=(arg0: Any): Boolean
final def ##(): Int
final def ==(arg0: Any): Boolean
final def asInstanceOf[T0]: T0
def clone(): AnyRef
def email(implicit reads: Reads[String]): Reads[String]
final def eq(arg0: AnyRef): Boolean
def equals(arg0: Any): Boolean
def filter[A](otherwise: ValidationError)(p: (A) â Boolean)(implicit reads: Reads[A]): Reads[A]
def filterNot[A](error: ValidationError)(p: (A) â Boolean)(implicit reads: Reads[A]): Reads[A]
def finalize(): Unit
final def getClass(): Class[_]
def hashCode(): Int
final def isInstanceOf[T0]: Boolean
def list[A](implicit reads: Reads[A]): Reads[List[A]]
def map[A](implicit reads: Reads[A]): Reads[Map[String, A]]
def max[N](m: N)(implicit reads: Reads[N], num: Numeric[N]): Reads[N]
Defines a maximum value for a numeric Reads.
def maxLength[M](m: Int)(implicit reads: Reads[M], p: (M) â TraversableLike[_, M]): Reads[M]
def min[N](m: N)(implicit reads: Reads[N], num: Numeric[N]): Reads[N]
Defines a minimum value for a numeric Reads.
def minLength[M](m: Int)(implicit reads: Reads[M], p: (M) â TraversableLike[_, M]): Reads[M]
final def ne(arg0: AnyRef): Boolean
final def notify(): Unit
final def notifyAll(): Unit
def of[A](implicit r: Reads[A]): Reads[A]
The simpler of all Reads that just finds an implicit Reads[A] of the expected type
def optionNoError[A](implicit reads: Reads[A]): Reads[Option[A]]
Stupidly reads a field as an Option mapping any error (format or missing field) to None
def optionWithNull[T](implicit rds: Reads[T]): Reads[Option[T]]
very simple optional field Reads that maps "null" to None
def pattern(regex: â Regex, error: String = "error.pattern")(implicit reads: Reads[String]): Reads[String]
Defines a regular expression constraint for String values, i.e.
def pure[A](a: â A): Reads[A]
def seq[A](implicit reads: Reads[A]): Reads[Seq[A]]
def set[A](implicit reads: Reads[A]): Reads[Set[A]]
final def synchronized[T0](arg0: â T0): T0
def toString(): String
def verifying[A](cond: (A) â Boolean)(implicit rds: Reads[A]): Reads[A]
def verifyingIf[A](cond: (A) â Boolean)(subreads: Reads[_])(implicit rds: Reads[A]): Reads[A]
final def wait(): Unit
final def wait(arg0: Long, arg1: Int): Unit
final def wait(arg0: Long): Unit
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