---
title: "CFStringFindWithOptionsAndLocale(_:_:_:_:_:_:)"
framework: corefoundation
role: symbol
role_heading: Function
path: "corefoundation/cfstringfindwithoptionsandlocale(_:_:_:_:_:_:)"
---

# CFStringFindWithOptionsAndLocale(_:_:_:_:_:_:)

Returns a Boolean value that indicates whether a given string was found in a given source string.

## Declaration

```swift
func CFStringFindWithOptionsAndLocale(_ theString: CFString!, _ stringToFind: CFString!, _ rangeToSearch: CFRange, _ searchOptions: CFStringCompareFlags, _ locale: CFLocale!, _ result: UnsafeMutablePointer<CFRange>!) -> Bool
```

## Parameters

- `theString`: The string in which to to search for stringToFind.
- `stringToFind`: The substring to search for in theString.
- `rangeToSearch`: A range of the characters to search in theString. The specified range must not exceed the length of the string.
- `searchOptions`: The option flags to control the search behavior. See doc://com.apple.corefoundation/documentation/CoreFoundation/string-comparison-flags for possible values. The flags doc://com.apple.corefoundation/documentation/CoreFoundation/CFStringCompareFlags/compareNumerically and doc://com.apple.corefoundation/documentation/CoreFoundation/CFStringCompareFlags/compareForcedOrdering are ignored.
- `locale`: The locale to use for the search comparison. NULL specifies the canonical locale (the return value from doc://com.apple.corefoundation/documentation/CoreFoundation/CFLocaleGetSystem()). The locale argument affects the equality checking algorithm. For example, for the Turkish locale, case-insensitive compare matches “I” to “ı” (Unicode code point U+0131, Latin Small Dotless I), not the normal “i” character.
- `result`: On return, if the function result is true contains the starting location and length of the found substring. You may pass NULL if you only want to know if the theString contains stringToFind.

## Return Value

Return Value true if the substring was found, false otherwise.

## Discussion

Discussion If stringToFind is the empty string (zero length), nothing is found.

## See Also

### Searching Strings

- [CFStringCreateArrayWithFindResults(_:_:_:_:_:)](corefoundation/cfstringcreatearraywithfindresults(_:_:_:_:_:).md)
- [CFStringFind(_:_:_:)](corefoundation/cfstringfind(_:_:_:).md)
- [CFStringFindCharacterFromSet(_:_:_:_:_:)](corefoundation/cfstringfindcharacterfromset(_:_:_:_:_:).md)
- [CFStringFindWithOptions(_:_:_:_:_:)](corefoundation/cfstringfindwithoptions(_:_:_:_:_:).md)
- [CFStringGetLineBounds(_:_:_:_:_:)](corefoundation/cfstringgetlinebounds(_:_:_:_:_:).md)