String#strip

strip → new_string

static VALUE
rb_str_strip(VALUE str)
{
    char *start;
    long olen, loffset, roffset;
    rb_encoding *enc = STR_ENC_GET(str);

    RSTRING_GETMEM(str, start, olen);
    loffset = lstrip_offset(str, start, start+olen, enc);
    roffset = rstrip_offset(str, start+loffset, start+olen, enc);

    if (loffset <= 0 && roffset <= 0) return str_duplicate(rb_cString, str);
    return rb_str_subseq(str, loffset, olen-loffset-roffset);
}

Returns a copy of the receiver with leading and trailing whitespace removed; see Whitespace in Strings:

Example

whitespace = "\x00\t\n\v\f\r "
s = whitespace + 'abc' + whitespace
s       # => "\u0000\t\n\v\f\r abc\u0000\t\n\v\f\r "
s.strip # => "abc"

Ruby version changes

3.0
- The following methods now return or yield String instances instead of subclass instances when called on subclass instances: [Bug #10845]

See also #strip! #start_with? #squeeze! #sub also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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