C# How to replace Microsoft's Smart Quotes with straight quotation marks?

Question

My post below asked what the curly quotation marks were and why my app wouldn't work with them, my question now is how can I replace them when my program comes across them, how can I do this in C#? Are they special characters?

curly-quotation-marks-vs-square-quotation-marks-what-gives

Thanks

Answer 1

When I encountered this problem I wrote an extension method to the String class in C#.

public static class StringExtensions
{
    public static string StripIncompatableQuotes(this string inputStr)
    {
        if (string.IsNullOrWhiteSpace(inputStr))
        {
            return inputStr;
        }
        
        return inputStr.Replace('\u2018', '\'').Replace('\u2019', '\'').Replace('\u201c', '\"').Replace('\u201d', '\"');
    }
}

This simply replaces the silly 'smart quotes' with normal quotes.

[EDIT] Fixed to also support replacement of 'double smart quotes'.

Answer 2

just chiming in, I had done this with Regex replace just to handle a few at a time based on what I'm replacing them with:

        public static string ReplaceWordChars(this string text)
        {
            var s = text;
            // smart single quotes and apostrophe,  single low-9 quotation mark, single high-reversed-9 quotation mark, prime
            s = Regex.Replace(s, "[\u2018\u2019\u201A\u201B\u2032]", "'");
            // smart double quotes, double prime
            s = Regex.Replace(s, "[\u201C\u201D\u201E\u2033]", "\"");
            // ellipsis
            s = Regex.Replace(s, "\u2026", "...");
            // em dashes
            s = Regex.Replace(s, "[\u2013\u2014]", "-");
            // horizontal bar
            s = Regex.Replace(s, "\u2015", "-");
            // double low line
            s = Regex.Replace(s, "\u2017", "-");
            // circumflex
            s = Regex.Replace(s, "\u02C6", "^");
            // open angle bracket
            s = Regex.Replace(s, "\u2039", "<");
            // close angle bracket
            s = Regex.Replace(s, "\u203A", ">");
            // weird tilde and nonblocking space
            s = Regex.Replace(s, "[\u02DC\u00A0]", " ");
            // half
            s = Regex.Replace(s, "[\u00BD]", "1/2");
            // quarter
            s = Regex.Replace(s, "[\u00BC]", "1/4");
            // dot
            s = Regex.Replace(s, "[\u2022]", "*");
            // degrees 
            s = Regex.Replace(s, "[\u00B0]", " degrees");

            return s;
        }

Also a few more replacements in there.

Answer 3

Using Nick and Barbara's answers, here is example code with performance stats for 1,000,000 loops on my machine:

input = "shmB6BhLe0gdGU8OxYykZ21vuxLjBo5I1ZTJjxWfyRTTlqQlgz0yUtPu8iNCCcsx78EPsObiPkCpRT8nqRtvM3Bku1f9nStmigaw";
input.Replace('\u2013', '-'); // en dash
input.Replace('\u2014', '-'); // em dash
input.Replace('\u2015', '-'); // horizontal bar
input.Replace('\u2017', '_'); // double low line
input.Replace('\u2018', '\''); // left single quotation mark
input.Replace('\u2019', '\''); // right single quotation mark
input.Replace('\u201a', ','); // single low-9 quotation mark
input.Replace('\u201b', '\''); // single high-reversed-9 quotation mark
input.Replace('\u201c', '\"'); // left double quotation mark
input.Replace('\u201d', '\"'); // right double quotation mark
input.Replace('\u201e', '\"'); // double low-9 quotation mark
input.Replace("\u2026", "..."); // horizontal ellipsis
input.Replace('\u2032', '\''); // prime
input.Replace('\u2033', '\"'); // double prime

Time: 958.1011 milliseconds

input = "shmB6BhLe0gdGU8OxYykZ21vuxLjBo5I1ZTJjxWfyRTTlqQlgz0yUtPu8iNCCcsx78EPsObiPkCpRT8nqRtvM3Bku1f9nStmigaw";
var inputArray = input.ToCharArray();
for (int i = 0; i < inputArray.Length; i++)
{
    switch (inputArray[i])
    {
        case '\u2013':
            inputArray[i] = '-';
            break;
        // en dash
        case '\u2014':
            inputArray[i] = '-';
            break;
        // em dash
        case '\u2015':
            inputArray[i] = '-';
            break;
        // horizontal bar
        case '\u2017':
            inputArray[i] = '_';
            break;
        // double low line
        case '\u2018':
            inputArray[i] = '\'';
            break;
        // left single quotation mark
        case '\u2019':
            inputArray[i] = '\'';
            break;
        // right single quotation mark
        case '\u201a':
            inputArray[i] = ',';
            break;
        // single low-9 quotation mark
        case '\u201b':
            inputArray[i] = '\'';
            break;
        // single high-reversed-9 quotation mark
        case '\u201c':
            inputArray[i] = '\"';
            break;
        // left double quotation mark
        case '\u201d':
            inputArray[i] = '\"';
            break;
        // right double quotation mark
        case '\u201e':
            inputArray[i] = '\"';
            break;
        // double low-9 quotation mark
        case '\u2026':
            inputArray[i] = '.';
            break;
        // horizontal ellipsis
        case '\u2032':
            inputArray[i] = '\'';
            break;
        // prime
        case '\u2033':
            inputArray[i] = '\"';
            break;
        // double prime
    }
}
input = new string(inputArray);

Time: 362.0858 milliseconds

Answer 4

it worked for me, you can try below code

string replacedstring = ("your string with smart quotes").Replace('\u201d', '\'');

Thanks!

Answer 5

To extend on Nick van Esch's popular answer, here is the code with the names of the characters in the comments.

if (buffer.IndexOf('\u2013') > -1) buffer = buffer.Replace('\u2013', '-'); // en dash
if (buffer.IndexOf('\u2014') > -1) buffer = buffer.Replace('\u2014', '-'); // em dash
if (buffer.IndexOf('\u2015') > -1) buffer = buffer.Replace('\u2015', '-'); // horizontal bar
if (buffer.IndexOf('\u2017') > -1) buffer = buffer.Replace('\u2017', '_'); // double low line
if (buffer.IndexOf('\u2018') > -1) buffer = buffer.Replace('\u2018', '\''); // left single quotation mark
if (buffer.IndexOf('\u2019') > -1) buffer = buffer.Replace('\u2019', '\''); // right single quotation mark
if (buffer.IndexOf('\u201a') > -1) buffer = buffer.Replace('\u201a', ','); // single low-9 quotation mark
if (buffer.IndexOf('\u201b') > -1) buffer = buffer.Replace('\u201b', '\''); // single high-reversed-9 quotation mark
if (buffer.IndexOf('\u201c') > -1) buffer = buffer.Replace('\u201c', '\"'); // left double quotation mark
if (buffer.IndexOf('\u201d') > -1) buffer = buffer.Replace('\u201d', '\"'); // right double quotation mark
if (buffer.IndexOf('\u201e') > -1) buffer = buffer.Replace('\u201e', '\"'); // double low-9 quotation mark
if (buffer.IndexOf('\u2026') > -1) buffer = buffer.Replace("\u2026", "..."); // horizontal ellipsis
if (buffer.IndexOf('\u2032') > -1) buffer = buffer.Replace('\u2032', '\''); // prime
if (buffer.IndexOf('\u2033') > -1) buffer = buffer.Replace('\u2033', '\"'); // double prime

Answer 6

The VB equivalent of what @Matthew wrote:

Public Module StringExtensions

    <Extension()>
    Public Function StripIncompatableQuotes(BadString As String) As String
        If Not String.IsNullOrEmpty(BadString) Then
            Return BadString.Replace(ChrW(&H2018), "'").Replace(ChrW(&H2019), "'").Replace(ChrW(&H201C), """").Replace(ChrW(&H201D), """")
        Else
            Return BadString
        End If
    End Function
End Module

Answer 7

Try this for smart single quotes if the above don't work:

string.Replace("\342\200\230", "'")
string.Replace("\342\200\231", "'")

Try this as well for smart double quotes:

string.Replace("\342\200\234", '"')
string.Replace("\342\200\235", '"')

Answer 8

I also have a program which does this, the source is in this file of CP-1252 Fixer. It additionally defines some mappings for converting characters within RTF strings whilst preserving all formatting, which may be useful to some.

It is also a complete mapping of all "smart quote" characters to their low-ascii counterparts, entity codes and character references.

Answer 9

A more extensive listing of problematic word characters

if (buffer.IndexOf('\u2013') > -1) buffer = buffer.Replace('\u2013', '-');
if (buffer.IndexOf('\u2014') > -1) buffer = buffer.Replace('\u2014', '-');
if (buffer.IndexOf('\u2015') > -1) buffer = buffer.Replace('\u2015', '-');
if (buffer.IndexOf('\u2017') > -1) buffer = buffer.Replace('\u2017', '_');
if (buffer.IndexOf('\u2018') > -1) buffer = buffer.Replace('\u2018', '\'');
if (buffer.IndexOf('\u2019') > -1) buffer = buffer.Replace('\u2019', '\'');
if (buffer.IndexOf('\u201a') > -1) buffer = buffer.Replace('\u201a', ',');
if (buffer.IndexOf('\u201b') > -1) buffer = buffer.Replace('\u201b', '\'');
if (buffer.IndexOf('\u201c') > -1) buffer = buffer.Replace('\u201c', '\"');
if (buffer.IndexOf('\u201d') > -1) buffer = buffer.Replace('\u201d', '\"');
if (buffer.IndexOf('\u201e') > -1) buffer = buffer.Replace('\u201e', '\"');
if (buffer.IndexOf('\u2026') > -1) buffer = buffer.Replace("\u2026", "...");
if (buffer.IndexOf('\u2032') > -1) buffer = buffer.Replace('\u2032', '\'');
if (buffer.IndexOf('\u2033') > -1) buffer = buffer.Replace('\u2033', '\"');

Answer 10

Note that what you have is inherently a corrupt CSV file. Indiscriminately replacing all typographer's quotes with straight quotes won't necessarily fix your file. For all you know, some of the typographer's quotes were supposed to be there, as part of a field's value. Replacing them with straight quotes might not leave you with a valid CSV file, either.

I don't think there is an algorithmic way to fix a file that is corrupt in the way you describe. Your time might be better spent investigating how you come to have such invalid files in the first place, and then putting a stop to it. Is someone using Word to edit your data files, for instance?

Answer 11

According to the Character Map application that comes with Windows, the Unicode values for the curly quotes are 0x201c and 0x201d. Replace those values with the straight quote 0x0022, and you should be good to go.

String.Replace(0x201c, '"');
String.Replace(0x201d, '"');