String#delete_prefix

(::string prefix) -> ::String

delete_prefix(prefix) → new_string

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 self with leading substring prefix removed:

Example

'hello'.delete_prefix('hel')      # => "lo"
'hello'.delete_prefix('llo')      # => "hello"
'тест'.delete_prefix('те')        # => "ст"
'こんにちは'.delete_prefix('こん')  # => "にちは"

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 · 3.3 · 3.2 · 3.1 · 3.0

‹ prev#delete! next ›#delete_prefix!