property NSString : a reference to current application’s NSString
property NSMutableArray : a reference to current application’s NSMutableArray
property NSDate : a reference to current application’s NSDate
property NSLiteralSearch : a reference to current application’s NSLiteralSearch

set aFile to POSIX path of (choose file)

set a1Dat to NSDate’s timeIntervalSinceReferenceDate()

set aStr to NSString’s stringWithContentsOfFile:aFile encoding:(current application’s NSUTF8StringEncoding) |error|:(missing value)
set aRes to searchWordRanges(aStr, "子供") of me as list
–>　　{​​​​​{​​​​​​​location:1159, ​​​​​​​length:2​​​​​}, ​​​​​{​​​​​​​location:1242, ​​​​​​​length:2​​​​​}, ​​​​​{​​​​​​​location:1261, ​​​​​​​length:2​​​​​}, ​​​​​…..

set b1Dat to NSDate’s timeIntervalSinceReferenceDate()
set c1Dat to b1Dat – a1Dat

on searchWordRanges(aTargText as string, aSearchStr as string)
　　set aStr to NSString’s stringWithString:aTargText
　　set bStr to NSString’s stringWithString:aSearchStr
　　
　　set hitArray to NSMutableArray’s alloc()’s init()
　　set cNum to (aStr’s |length|()) as integer
　　
　　set aRange to current application’s NSMakeRange(0, cNum)
　　
　　repeat
　　　　set detectedRange to aStr’s rangeOfString:bStr options:(NSLiteralSearch) range:aRange
　　　　if detectedRange’s location is equal to current application’s NSNotFound then exit repeat
　　　　
　　　　hitArray’s addObject:detectedRange
　　　　
　　　　set aNum to (detectedRange’s location) as integer
　　　　set bNum to (detectedRange’s |length|) as integer
　　　　
　　　　set aRange to current application’s NSMakeRange(aNum + bNum, cNum – (aNum + bNum))
　　end repeat
　　
　　return hitArray
end searchWordRanges