String getVersionPrefix() {
            try {
                final Matcher matcher = MIGRATION_FILE_PREFIX_REGEX_PATTERN.matcher(fileName);
                if (matcher.find()) {
                    return matcher.group();
                } else {
                    throw new RuntimeException("Prefix not found for '" + fileName + "'");
                }
            } catch (IllegalStateException e) {
                throw new RuntimeException("Prefix not found for '" + fileName + "': " + e.getMessage());
            }
        }
Finds all the v7 DB migration scripts and dumps them out in order.
Useful for seeing the sql and java migrations together
stroom-app/src/test/java/stroom/db/migration/TestListDbMigrations.java