[英]Jackson YAML: mapping a regex Pattern with flags
In Jackson, I can map a string in YAML:在 Jackson 中, 我可以在 YAML 中映射一个字符串:
regexField: "(\\d{2}):(\\d{2})"
to a Pattern
field on a class:到类上的
Pattern
字段:
final class MappedFromYaml {
private Pattern regexField;
// ... accessors
}
Jackson's ObjectMapper
will create a Pattern
with default flags. Jackson 的
ObjectMapper
将创建一个带有默认标志的Pattern
。 Is it possible to make it create it with specific flags set, such as Pattern.MULTILINE
?是否可以使用特定的标志集创建它,例如
Pattern.MULTILINE
? Ideally I would like to be able to specify those flags in YAML, but failing that a solution that specifies the flags for a specific field in Java code would also be appreciated.理想情况下,我希望能够在 YAML 中指定这些标志,但如果未能在 Java 代码中为特定字段指定标志的解决方案也将不胜感激。
There are two ways.有两种方法。 The first is embedding flags directly into the regex :
第一个是将标志直接嵌入到正则表达式中:
regexField: "(\\d{2}):(\\d{2})(?m)"
Otherwise don't map directly to Pattern
, but introduce a custom type like a PatternBuilder
否则不要直接映射到
Pattern
,而是引入一个像PatternBuilder
这样的自定义类型
public class PatternBuilder {
public String regex;
public boolean multiline;
public Pattern pattern() {
int flags = 0;
if (multiline) flags |= Pattern.MULTILINE;
return Pattern.compile(regex, flags);
}
}
that can be built from the YAML可以从 YAML 构建
pattern:
regex: "(\\d{2}):(\\d{2})"
multiline: true
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