Stringtemplate example showing how to extract individual characters from a "String"

test.groovy

@Grapes([
    @Grab('org.antlr:ST4:4.0.8'),
    @GrabConfig(systemClassLoader = true)])

import org.stringtemplate.v4.ST;
 
Word word = new Word("1234567890AB")

println word.getTomap()

/**
 * Test for splitting up a long string into delimited sections. 12-digit number to
 * be presented like "CAMS-000-00000000-0"
 */
ST hello = new ST("CAMS-<cams.tomap.0><cams.tomap.1><cams.tomap.2>-<cams.tomap.3><cams.tomap.4><cams.tomap.5><cams.tomap.6><cams.tomap.7><cams.tomap.8><cams.tomap.9><cams.tomap.10>-<cams.tomap.11>");
hello.add("cams", word);
println hello.render() // outputs CAMS-123-4567890A-B

class Word {
    final String v
    Word(String v) {
        this.v = v
    }
    Map<String, String> getTomap() {
        Map<String, String> out = new HashMap<>();
        String[] values = this.v.split("(?!^)");
        
        for (int i = 0; i < values.length; i++) {
          out.put(i + "", values[i])
        }
        
        return out
    }
    String toString() {
        return this.v
    }
}