lib/core: introduce replace_first in text/string_search

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/lib/core/text/string_search.nit b/lib/core/text/string_search.nit
index 6d6302e..7648816 100644 (file)
--- a/lib/core/text/string_search.nit
+++ b/lib/core/text/string_search.nit
@@ -482,6 +482,15 @@ redef class Text
                return self.split_with(pattern).join(string)
        end
 
+       # Replace the first occurrence of `pattern` with `string`
+       #
+       #     assert "hlelo".replace_first("le", "el") == "hello"
+       #     assert "hello".replace_first('l', "")    == "helo"
+       fun replace_first(pattern: Pattern, string: Text): String
+       do
+               return self.split_once_on(pattern).join(string)
+       end
+
        # Does `self` contains at least one instance of `pattern`?
        #
        #     assert "hello".has('l')