diff --git a/src/syntax/block.rs b/src/syntax/block.rs
index 6e142ec..deea665 100644
--- a/src/syntax/block.rs
+++ b/src/syntax/block.rs
@@ -1,15 +1,14 @@
 use nom::{
-    branch::alt,
     bytes::complete::{tag, tag_no_case},
-    character::complete::{alpha1, line_ending, space0},
-    combinator::eof,
+    character::complete::{alpha1, space0},
     sequence::tuple,
     IResult, InputTake,
 };
 
 use super::{
     combinator::{
-        blank_lines, line_starts_iter, node, token, trim_line_end, GreenElement, NodeBuilder,
+        blank_lines, eol_or_eof, line_starts_iter, node, token, trim_line_end, GreenElement,
+        NodeBuilder,
     },
     element::element_nodes,
     input::Input,
@@ -67,13 +66,8 @@ fn block_begin_node(input: Input) -> IResult<Input, (GreenElement, &str), ()> {
 }
 
 fn block_end_node<'a>(input: Input<'a>, name: &str) -> IResult<Input<'a>, GreenElement, ()> {
-    let (input, (ws, end, name, ws_, nl)) = tuple((
-        space0,
-        tag_no_case("#+END_"),
-        tag(name),
-        space0,
-        alt((line_ending, eof)),
-    ))(input)?;
+    let (input, (ws, end, name, ws_, nl)) =
+        tuple((space0, tag_no_case("#+END_"), tag(name), space0, eol_or_eof))(input)?;
 
     let mut b = NodeBuilder::new();
     b.ws(ws);
diff --git a/src/syntax/clock.rs b/src/syntax/clock.rs
index 0e98a31..99c179c 100644
--- a/src/syntax/clock.rs
+++ b/src/syntax/clock.rs
@@ -1,14 +1,16 @@
 use nom::{
     branch::alt,
     bytes::complete::tag,
-    character::complete::{digit1, line_ending, space0},
-    combinator::{eof, map, opt, recognize},
+    character::complete::{digit1, space0},
+    combinator::{map, opt, recognize},
     sequence::tuple,
     IResult,
 };
 
 use super::{
-    combinator::{blank_lines, colon_token, double_arrow_token, GreenElement, NodeBuilder},
+    combinator::{
+        blank_lines, colon_token, double_arrow_token, eol_or_eof, GreenElement, NodeBuilder,
+    },
     input::Input,
     timestamp::{timestamp_active_node, timestamp_inactive_node},
     SyntaxKind,
@@ -29,7 +31,7 @@ pub fn clock_node(input: Input) -> IResult<Input, GreenElement, ()> {
                 recognize(tuple((digit1, colon_token, digit1))),
             ))),
             space0,
-            alt((line_ending, eof)),
+            eol_or_eof,
             blank_lines,
         )),
         |(ws, clock, ws_, timestamp, duration, ws__, nl, post_blank)| {
diff --git a/src/syntax/combinator.rs b/src/syntax/combinator.rs
index 89552e7..2047e96 100644
--- a/src/syntax/combinator.rs
+++ b/src/syntax/combinator.rs
@@ -1,10 +1,7 @@
-use std::iter::once;
-
-use memchr::{memchr, memchr2_iter, memchr_iter};
-use nom::{
-    bytes::complete::tag, character::complete::space0, AsBytes, IResult, InputLength, InputTake,
-};
+use memchr::{memchr2, memchr2_iter, Memchr2};
+use nom::{bytes::complete::tag, AsBytes, IResult, InputTake, Slice};
 use rowan::{GreenNode, GreenToken, Language, NodeOrToken};
+use std::iter::once;
 
 use super::{input::Input, OrgLanguage, SyntaxKind, SyntaxKind::*};
 
@@ -101,13 +98,7 @@ pub fn blank_lines(input: Input) -> IResult<Input, Vec<GreenElement>, ()> {
     let mut start = 0;
     let bytes = input.as_bytes();
 
-    for index in memchr2_iter(b'\r', b'\n', bytes)
-        .map(|i| i + 1)
-        .chain(once(bytes.len()))
-    {
-        if bytes.get(index - 1) == Some(&b'\r') && bytes.get(index) == Some(&b'\n') {
-            continue;
-        }
+    for index in line_ends_iter(input.as_str()) {
         if start != index && bytes[start..index].iter().all(|b| b.is_ascii_whitespace()) {
             lines.push(token(BLANK_LINE, &input.as_str()[start..index]));
             start = index;
@@ -116,7 +107,7 @@ pub fn blank_lines(input: Input) -> IResult<Input, Vec<GreenElement>, ()> {
         }
     }
 
-    Ok((input.take_split(start).0, lines))
+    Ok((input.slice(start..), lines))
 }
 
 #[test]
@@ -159,21 +150,26 @@ fn test_blank_lines() {
 
 /// Returns 1. anything before trailing whitespace, 2. whitespace itself, 3. line feeding
 pub fn trim_line_end(input: Input) -> IResult<Input, (Input, Input, Input), ()> {
-    let (input, line) = input.take_split(
-        memchr(b'\n', input.as_bytes())
-            .map(|i| i + 1)
-            .unwrap_or(input.input_len()),
-    );
+    let bytes = input.as_bytes();
 
-    let (ws_and_nl, contents) = line.take_split(
-        line.as_bytes()
-            .iter()
-            .rposition(|u| !u.is_ascii_whitespace())
-            .map(|i| i + 1)
-            .unwrap_or(0),
-    );
+    let (input, contents, nl) = match memchr2(b'\r', b'\n', bytes) {
+        Some(i) if bytes[i] == b'\r' && matches!(bytes.get(i + 1), Some(b'\n')) => (
+            input.slice(i + 2..),
+            input.slice(0..i),
+            input.slice(i..i + 2),
+        ),
+        Some(i) => (
+            input.slice(i + 1..),
+            input.slice(0..i),
+            input.slice(i..i + 1),
+        ),
+        _ => (input.of(""), input, input.of("")),
+    };
 
-    let (nl, ws) = space0(ws_and_nl)?;
+    let (contents, ws) = match contents.bytes().rposition(|u| !u.is_ascii_whitespace()) {
+        Some(i) => (contents.slice(0..i + 1), contents.slice(i + 1..)),
+        None => (contents.of(""), contents),
+    };
 
     Ok((input, (contents, ws, nl)))
 }
@@ -200,18 +196,72 @@ fn test_trim_line_end() {
     assert_eq!(output.0.as_str(), "* hello, world :abc:");
     assert_eq!(output.1.as_str(), "  ");
     assert_eq!(output.2.as_str(), "\r\n");
+
+    let (input, output) = trim_line_end((" \rr", config).into()).unwrap();
+    assert_eq!(input.as_str(), "r");
+    assert_eq!(output.0.as_str(), "");
+    assert_eq!(output.1.as_str(), " ");
+    assert_eq!(output.2.as_str(), "\r");
+}
+
+/// Recognizes a line ending \r, \n, \r\n or end of file
+pub fn eol_or_eof(input: Input) -> IResult<Input, Input, ()> {
+    let mut bytes = input.bytes();
+
+    let count = match bytes.next() {
+        Some(b'\n') => 1,
+        Some(b'\r') => {
+            if matches!(bytes.next(), Some(b'\n')) {
+                2
+            } else {
+                1
+            }
+        }
+        None => 0,
+        _ => return Err(nom::Err::Error(())),
+    };
+
+    Ok(input.take_split(count))
+}
+
+struct LineStart<'a> {
+    bytes: &'a [u8],
+    iter: Memchr2<'a>,
+}
+
+impl<'a> LineStart<'a> {
+    fn new(input: &'a str) -> Self {
+        let bytes = input.as_bytes();
+        LineStart {
+            bytes,
+            iter: memchr2_iter(b'\r', b'\n', bytes),
+        }
+    }
+}
+
+impl<'a> Iterator for LineStart<'a> {
+    type Item = usize;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let i = self.iter.next()?;
+        if self.bytes[i] == b'\r' && self.bytes.get(i + 1) == Some(&b'\n') {
+            let ii = self.iter.next();
+            debug_assert_eq!(i + 1, ii.unwrap());
+            Some(i + 2)
+        } else {
+            Some(i + 1)
+        }
+    }
 }
 
 /// Returns an iterator of positions of line start, including zero
 pub fn line_starts_iter(s: &str) -> impl Iterator<Item = usize> + '_ {
-    once(0).chain(memchr_iter(b'\n', s.as_bytes()).map(|i| i + 1))
+    once(0).chain(LineStart::new(s))
 }
 
 /// Returns an iterator of positions of line end, including eof
 pub fn line_ends_iter(s: &str) -> impl Iterator<Item = usize> + '_ {
-    memchr_iter(b'\n', s.as_bytes())
-        .map(|i| i + 1)
-        .chain(once(s.len()))
+    LineStart::new(s).chain(once(s.len()))
 }
 
 pub struct NodeBuilder {
@@ -233,7 +283,7 @@ impl NodeBuilder {
     pub fn nl(&mut self, i: Input) {
         if !i.is_empty() {
             debug_assert!(
-                i.s == "\n" || i.s == "\r\n",
+                i.s == "\n" || i.s == "\r\n" || i.s == "\r",
                 "{:?} should be a new line",
                 i.s
             );
diff --git a/src/syntax/comment.rs b/src/syntax/comment.rs
index 434a2ea..6ccb55e 100644
--- a/src/syntax/comment.rs
+++ b/src/syntax/comment.rs
@@ -1,4 +1,4 @@
-use nom::{IResult, InputTake};
+use nom::{AsBytes, IResult, InputTake};
 
 use super::{
     combinator::{blank_lines, line_ends_iter, node, GreenElement},
@@ -9,10 +9,13 @@ use super::{
 fn comment_node_base(input: Input) -> IResult<Input, GreenElement, ()> {
     let mut start = 0;
     for i in line_ends_iter(input.as_str()) {
-        let line = &input.as_str()[start..i];
-        let trimmed = line.trim_start();
+        let mut iter = input.as_bytes()[start..]
+            .iter()
+            .skip_while(|&&b| b == b' ' || b == b'\t');
 
-        if trimmed == "#" || trimmed == "#\n" || trimmed == "#\r\n" || trimmed.starts_with("# ") {
+        if matches!(iter.next(), Some(b'#'))
+            && matches!(iter.next(), None | Some(b'\n') | Some(b'\r') | Some(b' '))
+        {
             start = i;
         } else {
             break;
diff --git a/src/syntax/drawer.rs b/src/syntax/drawer.rs
index 55216c9..a0bd5c7 100644
--- a/src/syntax/drawer.rs
+++ b/src/syntax/drawer.rs
@@ -1,16 +1,15 @@
 use nom::{
-    branch::alt,
     bytes::complete::{tag_no_case, take_while1},
-    character::complete::{line_ending, space0, space1},
-    combinator::{eof, iterator, map, opt},
+    character::complete::{space0, space1},
+    combinator::{iterator, map, opt},
     sequence::tuple,
     IResult, InputTake,
 };
 
 use super::{
     combinator::{
-        blank_lines, colon_token, line_starts_iter, node, plus_token, trim_line_end, GreenElement,
-        NodeBuilder,
+        blank_lines, colon_token, eol_or_eof, line_starts_iter, node, plus_token, trim_line_end,
+        GreenElement, NodeBuilder,
     },
     input::Input,
     SyntaxKind::*,
@@ -25,7 +24,7 @@ fn drawer_begin_node(input: Input) -> IResult<Input, (GreenElement, &str), ()> {
         take_while1(|c: char| c.is_ascii_alphabetic() || c == '-' || c == '_'),
         colon_token,
         space0,
-        alt((line_ending, eof)),
+        eol_or_eof,
     ))(input)?;
 
     b.ws(ws);
@@ -45,7 +44,7 @@ fn drawer_end_node(input: Input) -> IResult<Input, GreenElement, ()> {
         tag_no_case("END"),
         colon_token,
         space0,
-        alt((line_ending, eof)),
+        eol_or_eof,
     ))(input)?;
 
     let mut b = NodeBuilder::new();
diff --git a/src/syntax/dyn_block.rs b/src/syntax/dyn_block.rs
index 5e01397..eb9ad12 100644
--- a/src/syntax/dyn_block.rs
+++ b/src/syntax/dyn_block.rs
@@ -1,14 +1,14 @@
 use nom::{
-    branch::alt,
     bytes::complete::tag_no_case,
-    character::complete::{alpha1, line_ending, space0, space1},
-    combinator::eof,
+    character::complete::{alpha1, space0, space1},
     sequence::tuple,
     IResult, InputTake,
 };
 
 use super::{
-    combinator::{blank_lines, line_starts_iter, node, trim_line_end, GreenElement, NodeBuilder},
+    combinator::{
+        blank_lines, eol_or_eof, line_starts_iter, node, trim_line_end, GreenElement, NodeBuilder,
+    },
     input::Input,
     SyntaxKind::*,
 };
@@ -55,12 +55,8 @@ fn dyn_block_begin_node(input: Input) -> IResult<Input, GreenElement, ()> {
 }
 
 fn dyn_block_end_node(input: Input) -> IResult<Input, GreenElement, ()> {
-    let (input, (ws, end, ws_, nl)) = tuple((
-        space0,
-        tag_no_case("#+END:"),
-        space0,
-        alt((line_ending, eof)),
-    ))(input)?;
+    let (input, (ws, end, ws_, nl)) =
+        tuple((space0, tag_no_case("#+END:"), space0, eol_or_eof))(input)?;
 
     let mut b = NodeBuilder::new();
     b.ws(ws);
diff --git a/src/syntax/fixed_width.rs b/src/syntax/fixed_width.rs
index c16bc4b..32875f9 100644
--- a/src/syntax/fixed_width.rs
+++ b/src/syntax/fixed_width.rs
@@ -1,4 +1,4 @@
-use nom::{IResult, InputTake};
+use nom::{AsBytes, IResult, InputTake};
 
 use super::{
     combinator::{blank_lines, line_ends_iter, node, GreenElement},
@@ -9,10 +9,13 @@ use super::{
 fn fixed_width_node_base(input: Input) -> IResult<Input, GreenElement, ()> {
     let mut start = 0;
     for i in line_ends_iter(input.as_str()) {
-        let line = &input.s[start..i];
-        let trimmed = line.trim_start();
+        let mut iter = input.as_bytes()[start..]
+            .iter()
+            .skip_while(|&&b| b == b' ' || b == b'\t');
 
-        if trimmed == ":" || trimmed == ":\n" || trimmed == ":\r\n" || trimmed.starts_with(": ") {
+        if matches!(iter.next(), Some(b':'))
+            && matches!(iter.next(), None | Some(b'\n') | Some(b'\r') | Some(b' '))
+        {
             start = i;
         } else {
             break;
diff --git a/src/syntax/latex_environment.rs b/src/syntax/latex_environment.rs
index b731e1b..cbcdabf 100644
--- a/src/syntax/latex_environment.rs
+++ b/src/syntax/latex_environment.rs
@@ -1,8 +1,6 @@
 use nom::{
-    branch::alt,
     bytes::complete::{tag, take_while1},
-    character::complete::{line_ending, space0},
-    combinator::eof,
+    character::complete::space0,
     sequence::tuple,
     IResult, InputTake,
 };
@@ -10,7 +8,7 @@ use nom::{
 use crate::SyntaxKind;
 
 use super::{
-    combinator::{l_curly_token, line_starts_iter, node, r_curly_token, GreenElement},
+    combinator::{eol_or_eof, l_curly_token, line_starts_iter, node, r_curly_token, GreenElement},
     input::Input,
 };
 
@@ -36,7 +34,7 @@ fn latex_environment_node_base(input: Input) -> IResult<Input, GreenElement, ()>
             tag(name1.s),
             r_curly_token,
             space0,
-            alt((line_ending, eof)),
+            eol_or_eof,
         ))(input)
         {
             return Ok((
diff --git a/src/syntax/line_break.rs b/src/syntax/line_break.rs
index 019fab5..95b5789 100644
--- a/src/syntax/line_break.rs
+++ b/src/syntax/line_break.rs
@@ -1,13 +1,7 @@
-use nom::{
-    branch::alt,
-    character::complete::{line_ending, space0},
-    combinator::{eof, map},
-    sequence::tuple,
-    IResult,
-};
+use nom::{character::complete::space0, combinator::map, sequence::tuple, IResult};
 
 use crate::{
-    syntax::combinator::{backslash_token, node},
+    syntax::combinator::{backslash_token, eol_or_eof, node},
     SyntaxKind,
 };
 
@@ -16,12 +10,7 @@ use super::{combinator::GreenElement, input::Input};
 pub fn line_break_node(input: Input) -> IResult<Input, GreenElement, ()> {
     debug_assert!(input.s.starts_with('\\'));
     let mut parser = map(
-        tuple((
-            backslash_token,
-            backslash_token,
-            space0,
-            alt((line_ending, eof)),
-        )),
+        tuple((backslash_token, backslash_token, space0, eol_or_eof)),
         |(b1, b2, ws, nl)| {
             node(
                 SyntaxKind::LINE_BREAK,
diff --git a/src/syntax/planning.rs b/src/syntax/planning.rs
index 8560d3d..d35c270 100644
--- a/src/syntax/planning.rs
+++ b/src/syntax/planning.rs
@@ -1,14 +1,10 @@
 use nom::{
-    branch::alt,
-    bytes::complete::tag,
-    character::complete::{line_ending, space0},
-    combinator::{eof, iterator},
-    sequence::tuple,
-    IResult,
+    branch::alt, bytes::complete::tag, character::complete::space0, combinator::iterator,
+    sequence::tuple, IResult,
 };
 
 use super::{
-    combinator::{GreenElement, NodeBuilder},
+    combinator::{eol_or_eof, GreenElement, NodeBuilder},
     input::Input,
     timestamp::{timestamp_active_node, timestamp_inactive_node},
     SyntaxKind::*,
@@ -54,7 +50,7 @@ fn planning_node_base(input: Input) -> IResult<Input, GreenElement, ()> {
 
     let (input, _) = it.finish()?;
     let (input, ws) = space0(input)?;
-    let (input, nl) = alt((line_ending, eof))(input)?;
+    let (input, nl) = eol_or_eof(input)?;
 
     b.ws(ws);
     b.nl(nl);
diff --git a/src/syntax/rule.rs b/src/syntax/rule.rs
index 9dacd19..d498ea1 100644
--- a/src/syntax/rule.rs
+++ b/src/syntax/rule.rs
@@ -1,14 +1,10 @@
 use nom::{
-    branch::alt,
-    bytes::complete::take_while_m_n,
-    character::complete::{line_ending, space0},
-    combinator::{eof, map},
-    sequence::tuple,
+    bytes::complete::take_while_m_n, character::complete::space0, combinator::map, sequence::tuple,
     IResult,
 };
 
 use super::{
-    combinator::{blank_lines, GreenElement, NodeBuilder},
+    combinator::{blank_lines, eol_or_eof, GreenElement, NodeBuilder},
     input::Input,
     SyntaxKind::*,
 };
@@ -19,7 +15,7 @@ pub fn rule_node(input: Input) -> IResult<Input, GreenElement, ()> {
             space0,
             take_while_m_n(5, usize::max_value(), |c| c == '-'),
             space0,
-            alt((line_ending, eof)),
+            eol_or_eof,
             blank_lines,
         )),
         |(ws, dashes, ws_, nl, post_blank)| {
diff --git a/src/syntax/table.rs b/src/syntax/table.rs
index 803782d..93e937d 100644
--- a/src/syntax/table.rs
+++ b/src/syntax/table.rs
@@ -19,7 +19,7 @@ fn org_table_node_base(input: Input) -> IResult<Input, GreenElement, ()> {
     let mut start = 0;
     for i in line_ends_iter(input.as_str()) {
         let line = input.slice(start..i);
-        let trimmed = line.as_str().trim_start();
+        let trimmed = line.as_str().trim_start_matches([' ', '\t']);
 
         // Org tables end at the first line not starting with a vertical bar.
         if !trimmed.starts_with('|') {
@@ -81,7 +81,8 @@ fn table_standard_row_node(input: Input) -> Result<GreenElement, nom::Err<()>> {
             }
         }
     });
-    it.finish()?;
+    let (input, _) = it.finish()?;
+    debug_assert!(input.is_empty());
 
     Ok(b.finish(ORG_TABLE_STANDARD_ROW))
 }
diff --git a/tests/parse.rs b/tests/parse.rs
index 6f78ae8..813316b 100644
--- a/tests/parse.rs
+++ b/tests/parse.rs
@@ -23,9 +23,10 @@ const INPUT: &[&str] = &[
     // fuzz test
     "___\n",
     "\n\n\n",
-    "\n\n\n",
     "\n*",
-    "\r-"
+    "\r-",
+    "6\r\n",
+    "|\n\u{b}|"
 ];
 
 #[test]