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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..822b9bf
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "csvre"
+version = "0.1.0"
+authors = ["Oskari Timperi <oskari.timperi@iki.fi>"]
+edition = "2018"
+license = "GPL-3.0-or-later"
+
+[dependencies]
+csv = "1"
+regex = "1"
+docopt = "1.0.2"
+serde_derive = "1.0"
+serde = "1.0"
+
+[profile.release]
+# opt-level = 'z'
+lto = true
+codegen-units = 1
+panic = "abort"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b4c930b
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,327 @@
+use std::error::Error;
+use std::io;
+use std::process;
+
+use csv;
+use docopt;
+use regex;
+use serde_derive::Deserialize;
+
+#[derive(Debug)]
+enum MyError {
+    ColumnNotFound,
+    Csv(csv::Error),
+    Io(io::Error),
+    Regex(regex::Error),
+    ParseInt(std::num::ParseIntError),
+}
+
+impl Error for MyError {}
+
+impl std::fmt::Display for MyError {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match self {
+            MyError::ColumnNotFound => write!(f, "column not found"),
+            MyError::Csv(e) => e.fmt(f),
+            MyError::Io(e) => e.fmt(f),
+            MyError::Regex(e) => e.fmt(f),
+            MyError::ParseInt(e) => e.fmt(f),
+        }
+    }
+}
+
+impl From<csv::Error> for MyError {
+    fn from(error: csv::Error) -> Self {
+        if error.is_io_error() {
+            let error = error.into_kind();
+            match error {
+                csv::ErrorKind::Io(e) => MyError::Io(e),
+                _ => unreachable!(),
+            }
+        } else {
+            MyError::Csv(error)
+        }
+    }
+}
+
+impl From<io::Error> for MyError {
+    fn from(error: io::Error) -> Self {
+        MyError::Io(error)
+    }
+}
+
+impl From<regex::Error> for MyError {
+    fn from(error: regex::Error) -> Self {
+        MyError::Regex(error)
+    }
+}
+
+impl From<std::num::ParseIntError> for MyError {
+    fn from(error: std::num::ParseIntError) -> Self {
+        MyError::ParseInt(error)
+    }
+}
+
+const USAGE: &'static str = "
+csvre
+
+A simple tool for replacing data in CSV columns with regular
+expressions.
+
+USAGE:
+
+    csvre [options] --column=COLUMN <regex> <replacement>
+    csvre (-h | --help)
+    csvre --version
+
+ARGUMENTS:
+
+    <regex>
+
+        Regular expression used for matching.
+
+        For syntax documentation, see
+        https://docs.rs/regex/1.1.2/regex/#syntax
+
+        Some information about unicode handling can be found from
+        https://docs.rs/regex/1.1.2/regex/#unicode
+
+    <replacement>
+
+        Replacement string.
+
+        You can reference named capture groups in the regex with $name and
+        ${name} syntax. You can also use integers to reference capture
+        groups with $0 being the whole match, $1 the first group and so on.
+
+        If a capture group is not valid (name does not exist or index is
+        invalid), it is replaced with the empty string.
+
+        To insert a literal $, use $$.
+
+OPTIONS:
+
+    -h, --help
+
+        Show this message.
+
+    --version
+
+        Show the version number.
+
+    -d DELIM, --delimiter=DELIM
+
+        Field delimiter. This is used for both input and output.
+        [default: ,]
+
+    -c COLUMN, --column=COLUMN
+
+        Which column to operate on.
+
+        You can either use the column name or zero based index. If
+        you specify --no-headers, then you can only use the index
+        here.
+
+    -n, --no-headers
+
+        The input does not have a header row.
+
+        If you use this option, you can do matching against the first
+        row of input.
+
+    -b, --bytes
+
+        Don't assume utf-8 input, work on raw bytes instead.
+
+        See https://docs.rs/regex/1.1.2/regex/bytes/index.html#syntax
+        for differences to the normal matching rules.
+";
+
+#[derive(Deserialize)]
+struct Args {
+    arg_regex: String,
+    arg_replacement: String,
+    flag_delimiter: String,
+    flag_column: String,
+    flag_no_headers: bool,
+    flag_bytes: bool,
+}
+
+fn main() {
+    match run() {
+        Ok(()) => (),
+        Err(error) => {
+            match error {
+                MyError::Io(ref error) => {
+                    if error.kind() == io::ErrorKind::BrokenPipe {
+                        return;
+                    }
+                }
+                _ => (),
+            }
+            eprintln!("error: {}", error);
+            process::exit(1);
+        }
+    }
+}
+
+fn run() -> Result<(), MyError> {
+    let version = format!(
+        "{}.{}.{}",
+        env!("CARGO_PKG_VERSION_MAJOR"),
+        env!("CARGO_PKG_VERSION_MINOR"),
+        env!("CARGO_PKG_VERSION_PATCH")
+    );
+
+    let args: Args = docopt::Docopt::new(USAGE)
+        .and_then(|d| d.help(true).version(Some(version)).deserialize())
+        .unwrap_or_else(|e| e.exit());
+
+    let delimiter = args.flag_delimiter.as_bytes()[0];
+    let column_str = args.flag_column;
+
+    // (Ab)use Result as kind of an Either type ... :-)
+
+    let re = if args.flag_bytes {
+        Err(regex::bytes::Regex::new(&args.arg_regex)?)
+    } else {
+        Ok(regex::Regex::new(&args.arg_regex)?)
+    };
+
+    let replacement = if args.flag_bytes {
+        Err(args.arg_replacement.as_bytes())
+    } else {
+        Ok(args.arg_replacement.as_str())
+    };
+
+    let mut reader = csv::ReaderBuilder::new()
+        .delimiter(delimiter)
+        .has_headers(!args.flag_no_headers)
+        .flexible(true)
+        .from_reader(io::stdin());
+
+    let mut writer = csv::WriterBuilder::new()
+        .delimiter(delimiter)
+        .flexible(true)
+        .from_writer(io::stdout());
+
+    // If we have headers, and we cannot parse column as an integer,
+    // then we try to check if the column is included in the headers.
+    let column_index: usize = if reader.has_headers() {
+        reader.byte_headers()?;
+        match column_str.parse() {
+            Ok(n) => n,
+            Err(_) => {
+                if args.flag_bytes {
+                    reader.byte_headers()?
+                        .iter()
+                        .position(|x| x == column_str.as_bytes())
+                        .ok_or(MyError::ColumnNotFound)?
+                } else {
+                    reader.headers()?
+                        .iter()
+                        .position(|x| x == column_str)
+                        .ok_or(MyError::ColumnNotFound)?
+                }
+            }
+        }
+    } else {
+        column_str.parse()?
+    };
+
+    if args.flag_bytes {
+        run_bytes(
+            &mut reader,
+            &mut writer,
+            column_index,
+            re.as_ref().unwrap_err(),
+            replacement.unwrap_err(),
+        )?;
+    } else {
+        run_string(
+            &mut reader,
+            &mut writer,
+            column_index,
+            re.as_ref().unwrap(),
+            replacement.unwrap(),
+        )?;
+    }
+
+    writer.flush()?;
+
+    Ok(())
+}
+
+fn run_string<R, W>(
+    reader: &mut csv::Reader<R>,
+    writer: &mut csv::Writer<W>,
+    column_index: usize,
+    re: &regex::Regex,
+    replacement: &str,
+) -> Result<(), MyError>
+where
+    R: io::Read,
+    W: io::Write,
+{
+    let mut record_in = csv::StringRecord::new();
+    let mut record_out = csv::StringRecord::new();
+
+    if reader.has_headers() {
+        writer.write_record(reader.headers()?)?;
+    }
+
+    while reader.read_record(&mut record_in)? {
+        record_out.clear();
+
+        for index in 0..record_in.len() {
+            let field = record_in.get(index).unwrap();
+            let result = if index == column_index {
+                re.replace_all(field, replacement)
+            } else {
+                std::borrow::Cow::Borrowed(field)
+            };
+            record_out.push_field(&result);
+        }
+
+        writer.write_record(&record_out)?;
+    }
+
+    Ok(())
+}
+
+fn run_bytes<R, W>(
+    reader: &mut csv::Reader<R>,
+    writer: &mut csv::Writer<W>,
+    column_index: usize,
+    re: &regex::bytes::Regex,
+    replacement: &[u8],
+) -> Result<(), MyError>
+where
+    R: io::Read,
+    W: io::Write,
+{
+    let mut record_in = csv::ByteRecord::new();
+    let mut record_out = csv::ByteRecord::new();
+
+    if reader.has_headers() {
+        writer.write_byte_record(reader.byte_headers()?)?;
+    }
+
+    while reader.read_byte_record(&mut record_in)? {
+        record_out.clear();
+
+        for index in 0..record_in.len() {
+            let field = record_in.get(index).unwrap();
+            let result = if index == column_index {
+                re.replace_all(field, replacement)
+            } else {
+                std::borrow::Cow::Borrowed(field)
+            };
+            record_out.push_field(&result);
+        }
+
+        writer.write_byte_record(&record_out)?;
+    }
+
+    Ok(())
+}