String replacement in java, similar to a velocity template

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Use StringSubstitutor from Apache Commons Text.

https://commons.apache.org/proper/commons-text/

It will do it for you (and its open source…)

 Map<String, String> valuesMap = new HashMap<String, String>();
 valuesMap.put("animal", "quick brown fox");
 valuesMap.put("target", "lazy dog");
 String templateString = "The ${animal} jumped over the ${target}.";
 StringSubstitutor sub = new StringSubstitutor(valuesMap);
 String resolvedString = sub.replace(templateString);

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