1: //Perl style regex match operator, eg: foo =~ "foo"
 2: let (=~) target regex =
 3:   System.Text.RegularExpressions.Regex.IsMatch(target, regex)
 4: 
 5: 
 6: //Example
 7: let x = "lool";
 8: if x =~ "lo+l" then
 9:   printf "matched"
10: else
11:   printf "nope"

val target : string

  type: string
  implements: System.IComparable
  implements: System.ICloneable
  implements: System.IConvertible
  implements: System.IComparable<string>
  implements: seq<char>
  implements: System.Collections.IEnumerable
  implements: System.IEquatable<string>

val regex : string

  type: string
  implements: System.IComparable
  implements: System.ICloneable
  implements: System.IConvertible
  implements: System.IComparable<string>
  implements: seq<char>
  implements: System.Collections.IEnumerable
  implements: System.IEquatable<string>

namespace System

namespace System.Text

namespace System.Text.RegularExpressions

type Regex =
  class
    new : string -> System.Text.RegularExpressions.Regex
    new : string * System.Text.RegularExpressions.RegexOptions -> System.Text.RegularExpressions.Regex
    member GetGroupNames : unit -> string []
    member GetGroupNumbers : unit -> int []
    member GroupNameFromNumber : int -> string
    member GroupNumberFromName : string -> int
    member IsMatch : string -> bool
    member IsMatch : string * int -> bool
    member Match : string -> System.Text.RegularExpressions.Match
    member Match : string * int -> System.Text.RegularExpressions.Match
    member Match : string * int * int -> System.Text.RegularExpressions.Match
    member Matches : string -> System.Text.RegularExpressions.MatchCollection
    member Matches : string * int -> System.Text.RegularExpressions.MatchCollection
    member Options : System.Text.RegularExpressions.RegexOptions
    member Replace : string * string -> string
    member Replace : string * System.Text.RegularExpressions.MatchEvaluator -> string
    member Replace : string * string * int -> string
    member Replace : string * System.Text.RegularExpressions.MatchEvaluator * int -> string
    member Replace : string * string * int * int -> string
    member Replace : string * System.Text.RegularExpressions.MatchEvaluator * int * int -> string
    member RightToLeft : bool
    member Split : string -> string []
    member Split : string * int -> string []
    member Split : string * int * int -> string []
    member ToString : unit -> string
    static member CacheSize : int with get, set
    static member CompileToAssembly : System.Text.RegularExpressions.RegexCompilationInfo [] * System.Reflection.AssemblyName -> unit
    static member CompileToAssembly : System.Text.RegularExpressions.RegexCompilationInfo [] * System.Reflection.AssemblyName * System.Reflection.Emit.CustomAttributeBuilder [] -> unit
    static member CompileToAssembly : System.Text.RegularExpressions.RegexCompilationInfo [] * System.Reflection.AssemblyName * System.Reflection.Emit.CustomAttributeBuilder [] * string -> unit
    static member Escape : string -> string
    static member IsMatch : string * string -> bool
    static member IsMatch : string * string * System.Text.RegularExpressions.RegexOptions -> bool
    static member Match : string * string -> System.Text.RegularExpressions.Match
    static member Match : string * string * System.Text.RegularExpressions.RegexOptions -> System.Text.RegularExpressions.Match
    static member Matches : string * string -> System.Text.RegularExpressions.MatchCollection
    static member Matches : string * string * System.Text.RegularExpressions.RegexOptions -> System.Text.RegularExpressions.MatchCollection
    static member Replace : string * string * string -> string
    static member Replace : string * string * System.Text.RegularExpressions.MatchEvaluator -> string
    static member Replace : string * string * string * System.Text.RegularExpressions.RegexOptions -> string
    static member Replace : string * string * System.Text.RegularExpressions.MatchEvaluator * System.Text.RegularExpressions.RegexOptions -> string
    static member Split : string * string -> string []
    static member Split : string * string * System.Text.RegularExpressions.RegexOptions -> string []
    static member Unescape : string -> string
  end

Full name: System.Text.RegularExpressions.Regex

  type: System.Text.RegularExpressions.Regex
  implements: System.Runtime.Serialization.ISerializable

Multiple overloads
System.Text.RegularExpressions.Regex.IsMatch(input: string, pattern: string) : bool
System.Text.RegularExpressions.Regex.IsMatch(input: string, pattern: string, options: System.Text.RegularExpressions.RegexOptions) : bool

val x : string

Full name: Snippet.x

  type: string
  implements: System.IComparable
  implements: System.ICloneable
  implements: System.IConvertible
  implements: System.IComparable<string>
  implements: seq<char>
  implements: System.Collections.IEnumerable
  implements: System.IEquatable<string>

val printf : Printf.TextWriterFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printf