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version 2.109.1

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Function std.string.stripLeft

Strips leading whitespace (as defined by isWhite) or as specified in the second argument.

auto stripLeft(Range) (
  Range input
)
if (isForwardRange!Range && isSomeChar!(ElementEncodingType!Range) && !isInfinite!Range && !isConvertibleToString!Range);

auto stripLeft(Range, Char) (
  Range input,
  const(Char)[] chars
)
if ((isForwardRange!Range && isSomeChar!(ElementEncodingType!Range) || isConvertibleToString!Range) && isSomeChar!Char);

Parameters

NameDescription
input string or forward range of characters
chars string of characters to be stripped

Returns

input stripped of leading whitespace or characters specified in the second argument.

Postconditions

input and the returned value will share the same tail (see sameTail).

See Also

Generic stripping on ranges: stripLeft

Example

import std.uni : lineSep, paraSep;
assert(stripLeft("     hello world     ") ==
       "hello world     ");
assert(stripLeft("\n\t\v\rhello world\n\t\v\r") ==
       "hello world\n\t\v\r");
assert(stripLeft(" \u2028hello world") ==
       "hello world");
assert(stripLeft("hello world") ==
       "hello world");
assert(stripLeft([lineSep] ~ "hello world" ~ lineSep) ==
       "hello world" ~ [lineSep]);
assert(stripLeft([paraSep] ~ "hello world" ~ paraSep) ==
       "hello world" ~ [paraSep]);

import std.array : array;
import std.utf : byChar;
assert(stripLeft("     hello world     "w.byChar).array ==
       "hello world     ");
assert(stripLeft("     \u2022hello world     ".byChar).array ==
       "\u2022hello world     ");

Example

assert(stripLeft("     hello world     ", " ") ==
       "hello world     ");
assert(stripLeft("xxxxxhello world     ", "x") ==
       "hello world     ");
assert(stripLeft("xxxyy    hello world     ", "xy ") ==
       "hello world     ");

Example

import std.array : array;
import std.utf : byChar, byWchar, byDchar;

assert(stripLeft("  xxxyy hello world     "w.byChar, "xy ").array ==
       "hello world     ");

assert(stripLeft("\u2028\u2020hello world\u2028"w.byWchar,
                 "\u2028").array == "\u2020hello world\u2028");
assert(stripLeft("\U00010001hello world"w.byWchar, " ").array ==
       "\U00010001hello world"w);
assert(stripLeft("\U00010001 xyhello world"d.byDchar,
                 "\U00010001 xy").array == "hello world"d);

writeln(stripLeft("\u2020hello"w, "\u2020"w)); // "hello"w
writeln(stripLeft("\U00010001hello"d, "\U00010001"d)); // "hello"d
writeln(stripLeft(" hello ", "")); // " hello "

Authors

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

License

Boost License 1.0.