Escape backslashes in search and replacement

src/std/text.ab

@@ -1,11 +1,15 @@
 /// Replaces all occurrences of a pattern in the content with the provided replace text.
 pub fun replace(source, search, replace) {
-    return "\$\{source//{search}/{replace}}"
+    search = trust $ echo \$\{{nameof search}//\\\\/\\\\\\\\} $
+    replace = trust $ echo \$\{{nameof replace}//\\\\/\\\\\\\\} $
+    return trust $ echo \$\{{nameof source}//{search}/{replace}} $
 }
 
 /// Replaces the first occurrence of a pattern in the content with the provided replace text.
 pub fun replace_once(source, search, replace) {
-    return "\$\{source/{search}/{replace}}"
+    search = replace(search, "\\", "\\\\")
+    replace = replace(replace, "\\", "\\\\")
+    return trust $ echo \$\{{nameof source}/{search}/{replace}} $
 }
 
 /// Replaces all occurrences of a regex pattern in the content with the provided replace text.

src/tests/stdlib/replace.ab

@@ -2,7 +2,9 @@ import * from "std/text"
 
 // Output
 // apple apple
+// apple
 
 main {
     echo replace("banana banana", "banana", "apple")
+    echo replace("\\", "\\", "apple")
 }

src/tests/stdlib/replace_once.ab

@@ -1,4 +1,4 @@
 import * from "std/text"
 main {
-    echo replace_once("Succinctly", "inctly", "eeded")
+    echo replace_once("Succinctly\\", "inctly\\", "eeded")
 }