End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

String#delete_prefix

str.delete_prefix(prefix) → new_str

static VALUE
rb_str_delete_prefix(VALUE str, VALUE prefix)
{
    long prefixlen;

    prefixlen = deleted_prefix_length(str, prefix);
    if (prefixlen <= 0) return str_duplicate(rb_cString, str);

    return rb_str_subseq(str, prefixlen, RSTRING_LEN(str) - prefixlen);
}

Returns a copy of str with leading prefix deleted.

Example

"hello".delete_prefix("hel") #=> "lo"
"hello".delete_prefix("llo") #=> "hello"

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 #delete_prefix! #delete! #delete #delete_suffix also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1

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