Specific String search Coldfusion

<cfoutput>
  <cfset sourceString="This is a demo string and customer number is not 4537825 but it is 1998893 and not 19989990. Did you got it?" />
  Customer number from function is  #getCustomerNumber(sourceString)#.
</cfoutput>

<cffunction name="getCustomerNumber" returntype="numeric">
  <cfargument name="sourceString" required="true" type="string" />
  
  <cfset startYear = 1960 />
  <cfset endYear = dateformat(now(),'yyyy') />
    
  <cfset arrSearch = rematch("[\d]+",sourceString)>
  <cfset customerNumber = 0 />
  
  <cfloop from="1" to="#arraylen(arrSearch)#" index="i" step="1">
    <cfset cv = arrSearch[i] />
    <cfif len(trim(cv)) eq 7>
     <cfif ((left(cv,4) gte startYear) and (left(cv,4) lte endYear)) and ((right(cv,3) gt 0) and (right(cv,3) lt 1000))>
        <cfset customerNumber = cv />
        <cfreturn customerNumber />
     </cfif>
    </cfif>
  </cfloop> 
  <cfreturn customerNumber />
</cffunction>

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