Github user ottobackwards commented on a diff in the pull request:
https://github.com/apache/metron/pull/912#discussion_r164303393
--- Diff:
metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/dsl/functions/RegExFunctions.java
---
@@ -100,4 +100,39 @@ public Object apply(List<Object> list) {
return matcher.group(groupNumber);
}
}
+
+ @Stellar(name = "REGEXP_REPLACE",
+ description = "Replace all occurences of the regex pattern within
the string by value",
+ params = {
+ "string - The input string",
+ "pattern - The regex pattern to be replaced. Special characters
must be escaped (e.g. \\\\d)",
+ "value - The value to replace the regex pattern"
+ },
+ returns = "The modified input string with replaced values")
+ public static class RegexpReplace extends BaseStellarFunction {
+
+ @Override
+ public Object apply(List<Object> list) {
+ if (list.size() != 3) {
+ throw new IllegalStateException(
+ "REGEXP_REPLACE expects three args: [string, pattern, value]"
+ + " where pattern is a regexp pattern");
+ }
+ String str = (String) list.get(0);
+ String stringPattern = (String) list.get(1);
+ String value = (String) list.get(2);
+
--- End diff --
I think you want to check for null or empty
StringUtils.isEmpty(str)
---
