gistfile1.txt

def requiredColumnsRegs = [/ISSN|ISBN10/,/eISSN|ISSN13/,/Title/]
for (record in records) {
    try {
      	if (!haveRequiredColumns(requiredColumnsRegs, record)) {
        	record.value['drop-file'] = true
      	}
        output.write(record)
    } catch (e) {
        // Write a record to the error pipeline
        log.error(e.toString(), e)
        error.write(record, e.toString())
    }
}

def haveRequiredColumns(requiredColumnsRegs, record) {
  	for (column in record.value['originalFields'].keySet()) {
      	if (!anyMatch(column, requiredColumnsRegs)) {
        	return false;
      	}
  	}
  	return true
}
            
def anyMatch(str, regexList) {
  	for (reg in regexList) {
      	if (str ==~ reg) {
			return true  
    	}
  	}
  	return false
}