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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
Name | Description |
---|---|
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
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.