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# dmd.root.string

Contains various string related functions.
Authors:
Walter Bright, http://www.digitalmars.com
License:
Boost License 1.0

Source root/string.d

Documentation https://dlang.org/phobos/dmd_root_string.html

Coverage https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/string.d

pure nothrow @nogc inout(char)[] `toDString`(inout(char)* `s`);
  Slices a \0-terminated C-string, excluding the terminator
static bool `iequals`(const(char)[] `s1`, const(char)[] `s2`);
  Compare two slices for equality, in a case-insensitive way
  Comparison is based on char and does not do decoding. As a result, it's only really accurate for plain ASCII strings.
  Parameters:

  const(char)[] `s1` | string to compare
  const(char)[] `s2` | string to compare

  Returns:
  true if `s1` == `s2` regardless of case
nothrow auto `toCStringThen`(alias dg)(const(char)[] `src`);
  Copy the content of `src` into a C-string ('\0' terminated) then call dg
  The intent of this function is to provide an allocation-less way to call a C function using a D slice. The function internally allocates a buffer if needed, but frees it on exit.

  Note The argument to dg is scope. To keep the data around after dg exits, one has to copy it.

  Parameters:

  const(char)[] `src` | Slice to use to call the C function
  dg | Delegate to call afterwards

  Returns:
  The return value of T
pure nothrow @nogc @safe string `stripLeadingLineTerminator`(string `str`);
  Strips one leading line terminator of the given string.
  The following are what the Unicode standard considers as line terminators:
  | Name | D Escape Sequence | Unicode Code Point | |---------------------|-------------------|--------------------| | Line feed | \n | U+000A | | Line tabulation | \v | U+000B | | Form feed | \f | U+000C | | Carriage return | \r | U+000D | | Next line | | U+0085 | | Line separator | | U+2028 | | Paragraph separator | | U+2029 |
  This function will also strip \r\n.
@trusted int `dstrcmp`()(scope const char[] `s1`, scope const char[] `s2`);
  A string comparison functions that returns the same result as strcmp

  Note Strings are compared based on their ASCII values, no UTF-8 decoding.

  Some C functions (e.g. qsort) require a int result for comparison.
  See Also:
  Druntime's core.internal.string
char[N + 1] `toStaticArray`(size_t N)(scope const(char)[N] `literal`);
  Infers the length N of a string literal and coerces its type to a static array with length N + 1. Returns the string with a null character appended to the end.
  Parameters:

  const(char)[N] `literal` | string literal

  Notes

  - LDC produces quite optimal code for short strings: - https://d.godbolt.org/z/M69Z1g - https://gist.github.com/PetarKirov/338e4ab9292b6b2b311a3070572a07fb (backup URL)
  Examples:

      auto m = "123".toStaticArray;
      const c = "123".toStaticArray;
      immutable i = "123".toStaticArray;
      enum e = "123".toStaticArray;

      assert(m == "123\0");
      assert(c == "123\0");
      assert(i == "123\0");
      static assert(e == "123\0");

      const empty = "".toStaticArray;
      static assert(empty.length == 1);
      static assert(empty[0] == '\0');

pure nothrow @nogc @system bool `startsWith`(scope const(char)* `p`, scope const(char)[] `needle`);
  Checks if C string `p` starts with `needle`.
  Parameters:

  const(char)* `p` | the C string to check
  const(char)[] `needle` | the string to look for

  Returns:
  true if `p` starts with `needle`
  Examples:

      const buf = "123".toStaticArray;
      const ptr = &buf[0];
      assert(ptr.startsWith(""));
      assert(ptr.startsWith("1"));
      assert(ptr.startsWith("12"));
      assert(ptr.startsWith("123"));
      assert(!ptr.startsWith("1234"));

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