Question

我要验证所有具有'payload。*'的字符串，即该字符串必须以'payload'开头，后跟一个句点（。），然后至少一个字符。

示例：-

Input1 :- payload.Hello     Output1 :-> Valid
Input2 :- Hipayload.Hello     Output1 :-> InValid
Input3 :- payload.H     Output1 :-> Valid
Input4 :- payload.     Output1 :-> InValid

Answer 1

您可以使用x.matches(y)（其中x和y都是字符串）来匹配Scala中的Regex模式（或使用“原始”字符串）：

scala> val regex: String = "^payload\\..+"
regex: String = ^payload\..+

scala> val regexAltRaw: String = raw"^payload\..+"
regexAltRaw : String = ^payload\..+

scala> val regexAltTripleQuotes: String = """^payload\..+"""
regexAltTripleQuotes : String = ^payload\..+

scala> "".matches(regex)
res0: Boolean = false

scala> "payload.Hello".matches(regex)
res1: Boolean = true

scala> "Hipayload.Hello".matches(regex)
res2: Boolean = false

scala> "payload.H".matches(regex)
res3: Boolean = true

scala> "payload.".matches(regex)
res4: Boolean = false

解释模式：

^payload-以“有效载荷”开头
\\.-“。从字面上看（不使用“原始”字符串，Scala要求您使用双反斜杠来转义而不是像常规Regex中那样使用单反斜杠）
.+-任何字符，一次或多次

Answer 2

为了避免验证输入有效载荷，您可以使用以下正则表达式：

  ^ payload \。[^。] + $

Answer 3

输入数组：

val ar = Array("payload.Hello","Hipayload.Hello","payload.H","payload.")

正则表达式字符串：

 val p = """^payload\..{1,}"""

在Scala REPL中：

scala> val ar = Array("payload.Hello","Hipayload.Hello","payload.H","payload.")
ar: Array[String] = Array(payload.Hello, Hipayload.Hello, payload.H, payload.)

scala> val p = """^payload\..{1,}"""
p: String = ^payload\..{1,}

测试：

scala> ar.map(x=>if(x.matches(p))"Valid" else "InValid")
res3: Array[String] = Array(Valid, InValid, Valid, InValid)

正则表达式模式以检测有效载荷*模式

3 个答案: