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version 2.081.0

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std.string.indexOf - multiple declarations

Function indexOf

Searches for character in range.

ptrdiff_t indexOf(Range) (
  Range s,
  dchar c,
  CaseSensitive cs = Yes.caseSensitive
)
if (isInputRange!Range && isSomeChar!(ElementType!Range) && !isSomeString!Range);

ptrdiff_t indexOf(C) (
  C[] s,
  dchar c,
  CaseSensitive cs = Yes.caseSensitive
)
if (isSomeChar!C);

ptrdiff_t indexOf(Range) (
  Range s,
  dchar c,
  size_t startIdx,
  CaseSensitive cs = Yes.caseSensitive
)
if (isInputRange!Range && isSomeChar!(ElementType!Range) && !isSomeString!Range);

ptrdiff_t indexOf(C) (
  C[] s,
  dchar c,
  size_t startIdx,
  CaseSensitive cs = Yes.caseSensitive
)
if (isSomeChar!C);

Parameters

NameDescription
s string or InputRange of characters to search in correct UTF format
c character to search for
startIdx starting index to a well-formed code point
cs Yes.caseSensitive or No.caseSensitive

Returns

the index of the first occurrence of c in s with respect to the start index startIdx. If c is not found, then -1 is returned. If c is found the value of the returned index is at least startIdx. If the parameters are not valid UTF, the result will still be in the range [-1 .. s.length], but will not be reliable otherwise.

Throws

If the sequence starting at startIdx does not represent a well formed codepoint, then a UTFException may be thrown.

See Also

countUntil

Example

import std.typecons : No;

string s = "Hello World";
writeln(indexOf(s, 'W')); // 6
writeln(indexOf(s, 'Z')); // -1
writeln(indexOf(s, 'w', No.caseSensitive)); // 6

Example

import std.typecons : No;

string s = "Hello World";
writeln(indexOf(s, 'W', 4)); // 6
writeln(indexOf(s, 'Z', 100)); // -1
writeln(indexOf(s, 'w', 3, No.caseSensitive)); // 6

Function indexOf

Searches for substring in s.

ptrdiff_t indexOf(Range, Char) (
  Range s,
  const(Char)[] sub,
  in CaseSensitive cs = Yes.caseSensitive
)
if (isForwardRange!Range && isSomeChar!(ElementEncodingType!Range) && isSomeChar!Char);

ptrdiff_t indexOf(Char1, Char2) (
  const(Char1)[] s,
  const(Char2)[] sub,
  in size_t startIdx,
  in CaseSensitive cs = Yes.caseSensitive
) @safe
if (isSomeChar!Char1 && isSomeChar!Char2);

Parameters

NameDescription
s string or ForwardRange of characters to search in correct UTF format
sub substring to search for
startIdx the index into s to start searching from
cs Yes.caseSensitive or No.caseSensitive

Returns

the index of the first occurrence of sub in s with respect to the start index startIdx. If sub is not found, then -1 is returned. If the arguments are not valid UTF, the result will still be in the range [-1 .. s.length], but will not be reliable otherwise. If sub is found the value of the returned index is at least startIdx.

Throws

If the sequence starting at startIdx does not represent a well formed codepoint, then a UTFException may be thrown.

Bugs

Does not work with case insensitive strings where the mapping of tolower and toupper is not 1:1.

Example

import std.typecons : No;

string s = "Hello World";
writeln(indexOf(s, "Wo", 4)); // 6
writeln(indexOf(s, "Zo", 100)); // -1
writeln(indexOf(s, "wo", 3, No.caseSensitive)); // 6

Example

import std.typecons : No;

string s = "Hello World";
writeln(indexOf(s, "Wo")); // 6
writeln(indexOf(s, "Zo")); // -1
writeln(indexOf(s, "wO", No.caseSensitive)); // 6

Authors

Walter Bright, Andrei Alexandrescu, Jonathan M Davis, and David L. 'SpottedTiger' Davis

License

Boost License 1.0.