Question

我在凤凰城有一条需要用REGEX检查JSON参数的路由。在我的日常工作中，我正在创建一个错误列表，以便在一个或多个正则表达式失败时在正文中报告。但每当我运行代码时，我都会得到＆＃34; FunctionClauseError＆＃34; ＆＃34; Regex.match错误？＆＃34;。我尝试过String.match，但是它们评估的功能相同。

这是我的代码：

   def postServidor(conn, parameters) do
        reasons = []
        error = False
        if not Regex.match?(~r/^(19[0-9]{2}|2[0-9]{3})-(0[1-9]|1[012])-([123]0|[012][1-9]|31)$/, Map.get(parameters, "data_nascimento")) do
            {error, reasons} = {True, reasons ++ [%{Reason => "[data_nascimento] missing or failed to match API requirements. It should look like this: 1969-02-12"}]}
        end
        if not Regex.match?(~r/^([A-Z][a-z]+([ ]?[a-z]?['-]?[A-Z][a-z]+)*)$/, Map.get(parameters, "nome")) do            
            {error, reasons} = {True, reasons ++ [%{Reason => "[name] missing or failed to match API requirements. It should look like this: Firstname Middlename(optional) Lastname"}]}
        end
        if not Regex.match?(~r/^([A-Z][a-z]+([ ]?[a-z]?['-]?[A-Z][a-z]+)*)$/, Map.get(parameters, "nome_identificacao")) do
            {error, reasons} = {True, reasons ++ [%{Reason => "[nome_identificacao] missing or failed to match API requirements. It should look like this: Firstname Middlename(optional) Lastname"}]}
        end
        if not Regex.match?(~r/\b[MF]{1}\b/, Map.get(parameters, "sexo")) do
            {error, reasons} = {True, reasons ++ [%{Reason => "[sexo] missing or failed to match API requirements. It should look like this: M for male, F for female"}]}
        end
        if not Regex.match?( ~r/\b[0-9]+\b/, Map.get(parameters, "id_pessoa")) do
            {error, reasons} = {True, reasons ++ [%{Reason => "[id_pessoa] missing or failed to match API requirements. It should be numeric. "}]}
        end
        if not Regex.match?(~r/\b[0-9]+\b/, Map.get(parameters, "matricula_interna")) do
            {error, reasons} = {True, reasons ++ [%{Reason => "[matricula_interna] missing or failed to match API requirements. It should be numeric. "}]}
        end
        if not Regex.match?(~r/\b[0-9]+\b/, Map.get(parameters, "siape")) do
            {error, reasons} = {True, reasons ++ [%{Reason => "[siape] missing or failed to match API requirements. It should be numeric. "}]}
        end
        if error = True do
            json put_status(conn, 400),reasons
        else
            IO.puts("ok")
        end
    end

Answer 1

Regex.match?/2需要一个字符串作为其第二个参数。您使用Map.get/3可能会返回该字符串，但如果在地图中找不到该键，则默认为nil，这就是我猜测发生了什么。如果在地图中找不到密钥，则会将nil传递给Regex.match?/2，因为没有匹配的函数子句。您可以修复地图以正确使用密钥，也可以提供自己的默认字符串作为Map.get/3的第三个参数。例如，Map.get(parameters, "data_nascimento", "some default")。

在Elixir w / Phoenix上的Regex.match？/ 2中没有匹配的函数子句

1 个答案: