Find part of a string with regular expression in a given string

Thanks for your input. Actually I wrote my own function to test those three operators as below. Please let me know if you think I can still simplify this. Also I need to test one more condition that is when searched with text along with ~ (Ex. Muhamed~ returns results including Muhammad, Mohamed, Muhammed, etc.). Is there any way that I can test if the string is similar to what I searched for. I tried looking in to the reqular expressions but can't find it.

function VerifyString(colString, operatorType){
wordCount = stringArry.length-1
result = []
if (operatorType=='and'){
  for (j=0;j<=wordCount; j++){
    if (aqString.StrMatches(stringArry[j], colString) ==true){
      result.push(true)
    }else{
      result.push(false)
    }
    if (result.indexOf(false)==0){
      Log.Error("The text in the column "+colString+" doesn't contain the word "+stringArry[j])
    }
  }
}
if (operatorType=='or'){
  for (j=0;j<=wordCount; j++){
   if (aqString.StrMatches(stringArry[j], colString) ==true){
     result.push(true)
   }else{
     result.push(false)
   }
  }
  if (result.indexOf(true)==-1){
    Log.Error("The text in the column doesn't contains any of the search words "+colString)
  }
}
if (operatorType=='not'){
  for (j=0;j<=wordCount; j++){
   if (aqString.StrMatches(stringArry[j], colString) ==true){
     result.push(true)
   }else{
     result.push(false)
   }
   
  }
  //Log.Message(result.indexOf(true) +", "+result[wordCount])
  
  if (result.indexOf(true)==-1 || result[wordCount] != false){
    Log.Error("The text in the column doesn't match with the search string "+colString)
  }
}
}