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-rw-r--r--tests/stdlib/nre/replace.nim22
1 files changed, 22 insertions, 0 deletions
diff --git a/tests/stdlib/nre/replace.nim b/tests/stdlib/nre/replace.nim
new file mode 100644
index 000000000..5cf659f21
--- /dev/null
+++ b/tests/stdlib/nre/replace.nim
@@ -0,0 +1,22 @@
+include nre
+import unittest
+
+block: # replace
+  block: # replace with 0-length strings
+    check("".replace(re"1", proc (v: RegexMatch): string = "1") == "")
+    check(" ".replace(re"", proc (v: RegexMatch): string = "1") == "1 1")
+    check("".replace(re"", proc (v: RegexMatch): string = "1") == "1")
+
+  block: # regular replace
+    check("123".replace(re"\d", "foo") == "foofoofoo")
+    check("123".replace(re"(\d)", "$1$1") == "112233")
+    check("123".replace(re"(\d)(\d)", "$1$2") == "123")
+    check("123".replace(re"(\d)(\d)", "$#$#") == "123")
+    check("123".replace(re"(?<foo>\d)(\d)", "$foo$#$#") == "1123")
+    check("123".replace(re"(?<foo>\d)(\d)", "${foo}$#$#") == "1123")
+
+  block: # replacing missing captures should throw instead of segfaulting
+    expect IndexDefect: discard "ab".replace(re"(a)|(b)", "$1$2")
+    expect IndexDefect: discard "b".replace(re"(a)?(b)", "$1$2")
+    expect KeyError: discard "b".replace(re"(a)?", "${foo}")
+    expect KeyError: discard "b".replace(re"(?<foo>a)?", "${foo}")