fix(rust, python): str.contains strict=False took no effect

polars/polars-lazy/polars-plan/src/dsl/function_expr/strings.rs

@@ -121,7 +121,7 @@ pub(super) fn contains(s: &[Series], literal: bool, strict: bool) -> PolarsResul
                 if literal {
                     ca.contains_literal(pat)?
                 } else {
-                    ca.contains(pat)?
+                    ca.contains(pat, strict)?
                 }
             }
             None => BooleanChunked::full(ca.name(), false, ca.len()),
@@ -150,10 +150,7 @@ pub(super) fn contains(s: &[Series], literal: bool, strict: bool) -> PolarsResul
                 ca.into_iter()
                     .zip(pat.into_iter())
                     .map(|(opt_src, opt_val)| match (opt_src, opt_val) {
-                        (Some(src), Some(pat)) => {
-                            let re = Regex::new(pat).ok()?;
-                            Some(re.is_match(src))
-                        }
+                        (Some(src), Some(pat)) => Regex::new(pat).ok().map(|re| re.is_match(src)),
                         _ => Some(false),
                     })
                     .collect_trusted()

polars/polars-ops/src/chunked_array/strings/namespace.rs

@@ -160,14 +160,22 @@ pub trait Utf8NameSpaceImpl: AsUtf8 {
     }
 
     /// Check if strings contain a regex pattern.
-    fn contains(&self, pat: &str) -> PolarsResult<BooleanChunked> {
+    fn contains(&self, pat: &str, strict: bool) -> PolarsResult<BooleanChunked> {
         let ca = self.as_utf8();
-        let reg = Regex::new(pat)?;
-        let f = |s: &str| reg.is_match(s);
-        let mut out: BooleanChunked = if !ca.has_validity() {
-            ca.into_no_null_iter().map(f).collect()
-        } else {
-            ca.into_iter().map(|opt_s| opt_s.map(f)).collect()
+
+        let res_reg = Regex::new(pat);
+        let opt_reg = if strict { Some(res_reg?) } else { res_reg.ok() };
+
+        let mut out: BooleanChunked = match (opt_reg, ca.has_validity()) {
+            (Some(reg), false) => ca
+                .into_no_null_iter()
+                .map(|s: &str| reg.is_match(s))
+                .collect(),
+            (Some(reg), true) => ca
+                .into_iter()
+                .map(|opt_s| opt_s.map(|s: &str| reg.is_match(s)))
+                .collect(),
+            (None, _) => ca.into_iter().map(|_| None).collect(),
         };
         out.rename(ca.name());
         Ok(out)
@@ -178,7 +186,7 @@ pub trait Utf8NameSpaceImpl: AsUtf8 {
         // note: benchmarking shows that the regex engine is actually
         // faster at finding literal matches than str::contains.
         // ref: https://github.com/pola-rs/polars/pull/6811
-        self.contains(escape(lit).as_str())
+        self.contains(escape(lit).as_str(), true)
     }
 
     /// Check if strings ends with a substring

polars/tests/it/lazy/expressions/arity.rs

@@ -57,7 +57,7 @@ fn includes_null_predicate_3038() -> PolarsResult<()> {
                 move |s| {
                     s.utf8()?
                         .to_lowercase()
-                        .contains("not_exist")
+                        .contains("not_exist", true)
                         .map(|ca| Some(ca.into_series()))
                 },
                 GetOutput::from_type(DataType::Boolean),

py-polars/tests/unit/namespaces/test_string.py

@@ -250,6 +250,19 @@ def test_auto_explode() -> None:
 
 
 def test_contains() -> None:
+    # test strict/non strict
+    s_txt = pl.Series(["123", "456", "789"])
+    assert (
+        pl.Series([None, None, None]).cast(pl.Boolean).to_list()
+        == s_txt.str.contains("(not_valid_regex", literal=False, strict=False).to_list()
+    )
+    with pytest.raises(pl.ComputeError):
+        s_txt.str.contains("(not_valid_regex", literal=False, strict=True)
+    assert (
+        pl.Series([True, False, False]).cast(pl.Boolean).to_list()
+        == s_txt.str.contains("1", literal=False, strict=False).to_list()
+    )
+
     df = pl.DataFrame(
         data=[(1, "some * * text"), (2, "(with) special\n * chars"), (3, "**etc...?$")],
         schema=["idx", "text"],