用于在ArrayList

时间:2015-08-21 02:19:59

标签: java regex arraylist

我有一个String数组列表,我想找

//results.getOptions() is an ArrayList<String>

Integer counter = 0;
for ( String option : results.getOptions() ) {
   System.err.println( "Item "+counter+" :"+option );
   counter++;
}

这段代码的输出是:

Item 0 :<ET>read input: 11.844ms</ET>
Item 1 :<ET>import: 2069.9ms</ET>
Item 2 :<ET>calc: 23.022ms</ET>
Item 3 :<ET>decompress .tax: 5.451ms</ET>
Item 4 :<ET>decrypt .tax: 4.409ms</ET>
Item 5 :<ET>load .tax formsets: 7.929ms</ET>
Item 6 :<ET>There were 4 calc errors:
Item 7 :F941 0 ZIP 0 - <Error><FormCd>INWKS941</FormCd><Level>Fatal</Level><Source>Company</Source><Entity>50-7754170</Entity><Category>CompanyInfo</Category><Message>Zip code is invalid.  You must enter a valid ZIP code for your state.  Enter a correct ZIP code in this format 'nnnnn' or 'nnnnn-nnnn'.</Message></Error>.
Item 8 :F941 0 STATE 0 - <Error><FormCd>INWKS941</FormCd><Level>Fatal</Level><Source>Company</Source><Entity>50-7754170</Entity><Category>CompanyInfo</Category><Message>State abbreviation is invalid.  Enter your two-letter postal state abbreviation.</Message></Error>.
Item 9 :F941 0 L11 0 - <Error><FormCd>INWKS941</FormCd><Level>Fatal</Level><Source>Company</Source><Entity>50-7754170</Entity><Category>Calculation</Category><Message>Total taxes after adjustments does not equal the total quarter liability on Schedule B.  You must make the necessary adjustments to reconcile the amounts.</Message></Error>.
Item 10 :F941 0 L15 0 - <Error><FormCd>INWKS941</FormCd><Level>Informational</Level><Source>Company</Source><Entity>50-7754170</Entity><Category>FormInfo</Category><Message>There is a balance due on this form of $6567.78.</Message></Error>.
Item 11 :: 0.034ms</ET>
Item 12 :<ET>write FormML: 8.739ms</ET>
Item 13 :<ET>flush FormML: 0.602ms</ET>
Item 14 :<ET>copy FormML to output vector: 1.763ms</ET>
Item 15 :<ET>convert: 2147.71ms</ET>
Item 16 :<ET>write output: 0.782ms</ET>
Item 17 :<FORMSET id="FORMML"/>
Item 18 :<DATA size="247750"/>
Item 19 :<ERROR code="0"/>
Item 20 :

我希望捕获以:

开头的文本行(索引)
<ET>There were 4 calc errors:

结束于:

</ET>

(输出中的第6-11项)

我捕捉这些特定线条的正则表达式是什么。我有一段Java代码会返回索引但是正则表达式捕获这些行会是什么?

List<String> getMatchingStrings(List<String> list, String regex) {

  ArrayList<String> matches = new ArrayList<String>();

  Pattern p = Pattern.compile(regex);

  for (String s:list) {
    if (p.matcher(s).matches()) {
      matches.add(s);
    }
  }

  return matches
}

2 个答案:

答案 0 :(得分:1)

如果您尝试使用正则表达式单独匹配列表中的每个字符串:

正则表达式\\<ET\\>There were 4 calc errors:.*\\</ET\\>应该有效。因为特殊字符是转义的,.*匹配标记之间的所有字符。

答案 1 :(得分:1)

首先,正则表达式在单个字符串上运行,因此您必须将单独的字符串组合在一起。您可能希望将它们视为线条,因此这将起作用。

StringBuilder buf = new StringBuilder();
for (String option : results.getOptions()) {
    buf.append(option).append("\r\n");
}

接下来,您需要一个适用于多行的正则表达式,因此您需要DOTALL选项(&#34;在dotall模式下,表达式。匹配任何字符,包括行终止符&#34;)

另外,你需要正则表达式&#34;不情愿&#34;,与#34;贪婪&#34;相反,所以你需要.*?,而不是.*,而你想要在开始模式和结束模式之间捕获文本,因此您需要一个捕获组()

String regex = "<ET>There were 4 calc errors:(.*?)</ET>";
Pattern p = Pattern.compile(regex, Pattern.DOTALL);
Matcher m = p.matcher(buf.toString());
while (m.find()) {
    String errorText = m.group(1);
    // Use errorText here
}

当然,如果没有4个错误,你可以使用它:

String regex = "<ET>There were \\d+ calc errors:(.*?)</ET>";

捕获的文本将以换行符开头,因此您可以trim()错误文本,也可以添加到模式中。

String regex = "<ET>There were \\d+ calc errors:\r\n(.*?)</ET>";