Question

我需要从以下路径中提取.扩展名：

(_OasvkDSOEee_ruCXphIMsQ) /com.c.rb.gold.gbl.fw.proxy.component_jar/src/main/java/com/roup/ebus/mobile/api/common/resource/APIProxyResource.java
(_7ZgAUO-qEeeFqO9kl3sUYw) /cbmo-thgcb-ext-gm.war/src/main/app/WEB-INF/classes/rules/THMBK/APIRequestResponseMapper.xml
(_TM6vEFKjEee-NMziq4x8wA) /com.citi.rb.gold.memfis.sb.war/src/main/webapp/citibank/eclipselite/bank/memfis/sb/maintenance/SBBondCalculatorPopup.jsp

上面的每个文件路径都以＆＃34; n＆＃34;开头。白色空间的数量。我只需要.及其后面的部分，例如：

.java
.xml
.jsp
.anything

请帮忙。

Answer 1

如果你有一个像这样的数组中的字符串：

strings = [
  "(_OasvkDSOEee_ruCXphIMsQ) /com.c.rb.gold.gbl.fw.proxy.component_jar/src/main/java/com/roup/ebus/mobile/api/common/resource/APIProxyResource.java",
  "(_7ZgAUO-qEeeFqO9kl3sUYw) /cbmo-thgcb-ext-gm.war/src/main/app/WEB-INF/classes/rules/THMBK/APIRequestResponseMapper.xml",
  "(_TM6vEFKjEee-NMziq4x8wA) /com.citi.rb.gold.memfis.sb.war/src/main/webapp/citibank/eclipselite/bank/memfis/sb/maintenance/SBBondCalculatorPopup.jsp"
]

你可以像这样获得扩展名：

strings.flat_map do |string|
  # in single line, regex is /(\.[^\.]+)$/
  # here is multiline form with explanation:
  regex = %r{
    (             # start of match group
      \.          # period
      [^\.]+ .    # any number of chars other than period
    )             # end of match group
    $             # end of string
  }x
  string.match(regex).captures
end
# => [".java", ".xml", ".jsp"]

Answer 2

您可以使用File.extname：

File.extname("/abcd/INF/classes/rules/THMBK/APIRequestResponseMapper.xml")
=> .xml
File.extname("fdsfdsdf /abcd/INF/classes/rules/THMBK/APIRequestResponseMapper.xml")
=> ".xml"

从文件路径中获取/提取.extension

2 个答案: