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instance method
String#delete_prefix!
str.delete_prefix!(prefix) → self or nil
string.c
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static VALUE
rb_str_delete_prefix_bang(VALUE str, VALUE prefix)
{
long prefixlen;
str_modify_keep_cr(str);
prefixlen = deleted_prefix_length(str, prefix);
if (prefixlen <= 0) return Qnil;
return rb_str_drop_bytes(str, prefixlen);
}
Deletes leading prefix from str, returning nil if no change was made.
Example
"hello".delete_prefix!("hel") #=> "lo" "hello".delete_prefix!("llo") #=> nil
See also
#delete_prefix
#delete_suffix
#delete!
#delete_suffix!
also in
4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0