diff --git a/markdown_it/rules_inline/linkify.py b/markdown_it/rules_inline/linkify.py
index a8a18153..88224e78 100644
--- a/markdown_it/rules_inline/linkify.py
+++ b/markdown_it/rules_inline/linkify.py
@@ -27,7 +27,7 @@ def linkify(state: StateInline, silent: bool) -> bool:
     ):
         return False
 
-    if not (match := SCHEME_RE.match(state.pending)):
+    if not (match := SCHEME_RE.search(state.pending)):
         return False
 
     proto = match.group(1)
diff --git a/tests/test_port/fixtures/linkify.md b/tests/test_port/fixtures/linkify.md
index f51bb6b9..02a23b17 100644
--- a/tests/test_port/fixtures/linkify.md
+++ b/tests/test_port/fixtures/linkify.md
@@ -211,3 +211,38 @@ google\.com
 .
 <p>google.com</p>
 .
+
+Issue [#300](https://github.com/executablebooks/markdown-it-py/issues/300) emphasis inside raw links (underscore) at beginning of line
+.
+http://example.org/foo._bar_-_baz This works
+.
+<p><a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a> This works</p>
+.
+
+Issue [#300](https://github.com/executablebooks/markdown-it-py/issues/300) emphasis inside raw links (underscore) at end of line
+.
+This doesnt http://example.org/foo._bar_-_baz
+.
+<p>This doesnt <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a></p>
+.
+
+Issue [#300](https://github.com/executablebooks/markdown-it-py/issues/300) emphasis inside raw links (underscore) mix1
+.
+While this `does` http://example.org/foo._bar_-_baz, this doesnt http://example.org/foo._bar_-_baz and this **does** http://example.org/foo._bar_-_baz
+.
+<p>While this <code>does</code> <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a>, this doesnt <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a> and this <strong>does</strong> <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a></p>
+.
+
+Issue [#300](https://github.com/executablebooks/markdown-it-py/issues/300) emphasis inside raw links (underscore) mix2
+.
+This applies to _series of URLs too_ http://example.org/foo._bar_-_baz http://example.org/foo._bar_-_baz, these dont http://example.org/foo._bar_-_baz http://example.org/foo._bar_-_baz and these **do** http://example.org/foo._bar_-_baz http://example.org/foo._bar_-_baz
+.
+<p>This applies to <em>series of URLs too</em> <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a> <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a>, these dont <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a> <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a> and these <strong>do</strong> <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a> <a href="http://example.org/foo._bar_-_baz">http://example.org/foo._bar_-_baz</a></p>
+.
+
+emphasis inside raw links (asterisk) at end of line
+.
+This doesnt http://example.org/foo.*bar*-*baz
+.
+<p>This doesnt <a href="http://example.org/foo.*bar*-*baz">http://example.org/foo.*bar*-*baz</a></p>
+.
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