在java中的两个特殊字符之间提取字符串的一部分

Question

String stringToSearch = "About ||PrimarySchool|| %  of children in ||Country|| attend primary school. ||SecondarySchoolFemale|| % of girls and ||SecondarySchoolMale|| % of boys finish secondary school. Literacy is ||LiteracyFemale|| % for females and ||LiteracyMale|| % for males.";

我希望在||anystring||这两个特殊字符之间添加额外字符串，但它不起作用。我尝试使用Java的Pattern-Matcher，但它不起作用 - 它返回一个空数组。

我试图关注Java- Extract part of a string between two special characters。

Pattern pattern = Pattern.compile("||(.*?)||");

Answer 1

这是因为|字符在Regex中具有特殊含义，因此您必须使用\字符来转义它。请参阅Regex101上的演示。

此外，在Java中，您必须使用双反斜杠\\来转义此字符。

Pattern pattern = Pattern.compile("\\|\\|(.*?)\\|\\|");

Answer 2

您需要转义|

String stringToSearch = "About ||PrimarySchool|| %  of children in ||Country|| attend primary school. ||SecondarySchoolFemale|| % of girls and ||SecondarySchoolMale|| % of boys finish secondary school. Literacy is ||LiteracyFemale|| % for females and ||LiteracyMale|| % for males.";
Pattern pattern = Pattern.compile("\\|\\|([^|]*)\\|\\|");
Matcher matcher = pattern.matcher(stringToSearch);
while (matcher.find()) {
    System.out.println(matcher.group(1));
}

结果：

PrimarySchool
Country
SecondarySchoolFemale
SecondarySchoolMale
LiteracyFemale
LiteracyMale