| public static preg_quote ( string str, string delimiter = null ) : string | ||
| str | string | The string to be escaped. |
| delimiter | string | If the optional delimiter is specified, it will also be escaped. /// This is useful for escaping the delimiter that is required by the PCRE functions. The / is the most commonly used delimiter. |
| return | string | |
public static string preg_quote(string str, string delimiter = null)
{
if (string.IsNullOrEmpty(str))
{
return str;
}
char delimiterChar = string.IsNullOrEmpty(delimiter)
? char.MaxValue // unused (?)
: delimiter[0];
StringBuilder result = null;
int lastEscape = 0;
for (int i = 0; i < str.Length; i++)
{
char ch = str[i];
bool escape = ch == delimiterChar || PerlRegex.RegexParser.IsDelimiterChar(ch);
if (escape)
{
if (result == null)
{
result = new StringBuilder(str.Length + 4);
}
result.Append(str, lastEscape, i - lastEscape);
result.Append('\\');
lastEscape = i;
}
}
if (result != null)
{
result.Append(str, lastEscape, str.Length - lastEscape);
return result.ToString();
}
else
{
return str;
}
}