Method ExtString.FindWord

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Overload

Finds whole word. Returns its 0-based index, or -1 if not found.

public static int FindWord(this string t, string s, Range? range = null, bool ignoreCase = false, string otherWordChars = null, Func<char, bool> isWordChar = null)

Parameters

t  (string) This string.

s  (string) Substring to find.

range  (Range?) The search range.

ignoreCase  (bool) Case-insensitive.

otherWordChars  (string) Additional word characters. For example "_".

isWordChar  (Func<char, bool>) Function that returns true for word characters. If null, uses char.IsLetterOrDigit.

Returns

int

Exceptions

ArgumentNullException s is null.

ArgumentOutOfRangeException Invalid range.

Remarks

If s starts with a word character, finds substring that is not preceded by a word character. If s ends with a word character, finds substring that is not followed by a word character. Word characters are those for which isWordChar or char.IsLetterOrDigit returns true plus those specified in otherWordChars. Uses ordinal comparison (does not depend on current culture/locale). For Unicode surrogates (2-char characters) calls char.IsLetterOrDigit and ignores isWordChar and otherWordChars.