How Can I Efficiently Insert Spaces Before Capital Letters in a String, While Handling Acronyms?

Inserting Spaces Before Capital Letters in Strings

Given a string like "ThisStringHasNoSpacesButItDoesHaveCapitals," many developers seek methods to insert spaces before capital letters, transforming it into "This String Has No Spaces But It Does Have Capitals."

While regular expressions can be utilized, such as System.Text.RegularExpressions.Regex.Replace(value, "[A-Z]", " $0"), they come with performance drawbacks.

An alternative approach is to employ a custom function like:

string AddSpacesToSentence(string text)
{
    if (string.IsNullOrWhiteSpace(text))
        return "";
    StringBuilder newText = new StringBuilder(text.Length * 2);
    newText.Append(text[0]);
    for (int i = 1; i < text.Length; i++)
    {
        if (char.IsUpper(text[i]) &amp;&amp; text[i - 1] != ' ')
            newText.Append(' ');
        newText.Append(text[i]);
    }
    return newText.ToString();
}

This function outperforms the regex approach, completing 100,000 conversions of the string "Abbbbbbbbb" repeated 100 times in only 7.6% of the time.

Acronym Handling

To address potential concerns about acronyms, the function can be modified as follows:

string AddSpacesToSentence(string text, bool preserveAcronyms)
{
    if (string.IsNullOrWhiteSpace(text))
        return "";
    StringBuilder newText = new StringBuilder(text.Length * 2);
    newText.Append(text[0]);
    for (int i = 1; i < text.Length; i++)
    {
        if (char.IsUpper(text[i]))
            if ((text[i - 1] != ' ' &amp;&amp; !char.IsUpper(text[i - 1])) ||
                (preserveAcronyms &amp;&amp; char.IsUpper(text[i - 1]) &amp;&amp;
                 i < text.Length - 1 &amp;&amp; !char.IsUpper(text[i + 1])))
                newText.Append(' ');
        newText.Append(text[i]);
    }
    return newText.ToString();
}

This updated function will correctly preserve acronyms in the formatted string.

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