reg Namespace Reference

Namespace for the regular expression functions. More...

Classes
class	PToken
	Class representing a token in the compiled regular expression token stream. More...
class	Ex
	Class representing a regular expression. More...
class	SubMatch
	Object representing the match results of a capture range. More...
class	Match
	Object representing the matching results. More...
class	Iterator
	Class to iterate through matches. More...

Functions
static bool	isspace (char c)
static bool	isalpha (char c)
static bool	isdigit (char c)
static bool	isalnum (char c)
static std::string	wildcard2regex (std::string_view pattern)
bool	search (std::string_view str, Match &match, const Ex &re, size_t pos=0)
	Search in a given string str starting at position pos for a match against regular expression re.
bool	search (std::string_view str, const Ex &re, size_t pos=0)
	Search in a given string str starting at position pos for a match against regular expression re.
bool	match (std::string_view str, Match &match, const Ex &re)
	Matches a given string str for a match against regular expression re.
bool	match (std::string_view str, const Ex &re)
	Matches a given string str for a match against regular expression re.
std::string	replace (std::string_view str, const Ex &re, std::string_view replacement)
	Searching in a given input string for parts that match regular expression re and replaces those parts by string replacement.

Detailed Description

Namespace for the regular expression functions.

Function Documentation

isalnum()

bool reg::isalnum ( char c )

inlinestatic

Definition at line 48 of file regex.cpp.

{
  return isalpha(c) || isdigit(c);
}

References isalpha(), and isdigit().

Referenced by reg::Ex::Private::matchAt().

isalpha()

bool reg::isalpha ( char c )

inlinestatic

Definition at line 38 of file regex.cpp.

{
  return static_cast<unsigned char>(c)>=128 || (c>='a' && c<='z') || (c>='A' && c<='Z');
}

Referenced by isalnum(), and reg::Ex::Private::matchAt().

isdigit()

bool reg::isdigit ( char c )

inlinestatic

Definition at line 43 of file regex.cpp.

{
  return c>='0' && c<='9';
}

Referenced by isalnum(), and reg::Ex::Private::matchAt().

isspace()

bool reg::isspace ( char c )

inlinestatic

Definition at line 33 of file regex.cpp.

{
  return c==' ' || c=='\t' || c=='\n' || c=='\r';
}

Referenced by reg::Ex::Private::matchAt().

match() [1/2]

bool reg::match	(	std::string_view	str,
		const Ex &	re )

Matches a given string str for a match against regular expression re.

Returns true iff a match was found for the whole string.

Definition at line 858 of file regex.cpp.

{
  Match match;
  return re.match(str,match,0) && match.position()==0 && match.length()==str.length();
}

References reg::Ex::match(), and match().

match() [2/2]

bool reg::match	(	std::string_view	str,
		Match &	match,
		const Ex &	re )

Matches a given string str for a match against regular expression re.

Returns true iff a match was found for the whole string. Any capture groups are returned via the match object.

Definition at line 853 of file regex.cpp.

{
  return re.match(str,match,0) && match.position()==0 && match.length()==str.length();
}

References reg::Ex::match(), and match().

Referenced by dateTimeFromString(), endBrief(), genericPatternMatch(), getFilterFromList(), DocParser::handleStyleArgument(), VhdlDocGen::isNumber(), match(), match(), replace(), search(), search(), setOutput(), and LayoutParser::startLayout().

replace()

std::string reg::replace	(	std::string_view	str,
		const Ex &	re,
		std::string_view	replacement )

Searching in a given input string for parts that match regular expression re and replaces those parts by string replacement.

Definition at line 864 of file regex.cpp.

{
  std::string result;
  Match match;
  size_t p=0;
  while (re.match(str,match,p))
  {
    size_t i=match.position();
    size_t l=match.length();
    if (i>p) result+=str.substr(p,i-p);
    result+=replacement;
    p=i+l;
  }
  if (p<str.length()) result+=str.substr(p);
  return result;
}

References reg::Ex::match(), and match().

Referenced by VhdlDocGen::addBaseClass(), VHDLOutlineParser::checkInlineCode(), FlowChart::printNode(), and replaceAnonymousScopes().

search() [1/2]

bool reg::search	(	std::string_view	str,
		const Ex &	re,
		size_t	pos = 0 )

Search in a given string str starting at position pos for a match against regular expression re.

Returns true iff a match was found.

Definition at line 847 of file regex.cpp.

{
  Match match;
  return re.match(str,match,pos);
}

References reg::Ex::match(), and match().

search() [2/2]

bool reg::search	(	std::string_view	str,
		Match &	match,
		const Ex &	re,
		size_t	pos = 0 )

Search in a given string str starting at position pos for a match against regular expression re.

Returns true iff a match was found. Details of what part of the string has matched is returned via the match object.

An example to show how to match all identifiers in a string.

static reg::Ex re(R"(\a\w*)");
std::string = u8"void(Func是<B_C::Códe42>(42));";
while (reg::search(str,match,re,pos))
{
  std::cout << match.str() << std::endl;
  pos=match.position()+match.length();
}

produces:

void
Func是
B_C
Códe42

See also

Ex::Ex() for details on the regular expression patterns.

Definition at line 842 of file regex.cpp.

{
  return re.match(str,match,pos);
}

References reg::Ex::match(), and match().

Referenced by HtmlHelpIndex::addItem(), addValidAliasToMap(), addVariable(), addVariableToFile(), VHDLOutlineParser::checkInlineCode(), containsEnvVar(), MemberDefImpl::displayDefinition(), expandAliasRec(), Markdown::Private::extractTitleId(), findFunctionPtr(), findIndex(), MemberDefImpl::getClassDefOfAnonymousType(), FormulaManager::initFromRepository(), insertDimension(), isVarWithConstructor(), loadExtensions(), loadStylesheet(), matchExcludedSymbols(), MarkdownOutlineParser::parseInput(), runQHelpGenerator(), StyleData::setStyle(), simplifyTypeForTable(), splitKnRArg(), StyleData::StyleData(), DotAttributes::updateValue(), MemberDefImpl::writeDeclaration(), and MemberDefImpl::writeDocumentation().

wildcard2regex()

std::string reg::wildcard2regex ( std::string_view pattern )

static

Definition at line 743 of file regex.cpp.

{
  std::string result="^"; // match start of input
  result.reserve(pattern.length());
  for (size_t i=0;i<pattern.length();i++)
  {
    char c=pattern[i];
    switch(c)
    {
      case '*':
        result+=".*";
        break; // '*' => '.*'
      case '?':
        result+='.';
        break; // '?' => '.'
      case '.':
      case '+':
      case '\\':
      case '$':
      case '^':
      case '(':
      case ')':
         result+='\\'; result+=c;  // escape
         break;
      case '[':
         if (i<pattern.length()-1 && pattern[i+1]=='^') // don't escape ^ after [
         {
           result+="[^";
           i++;
         }
         else
         {
           result+=c;
         }
        break;
      default:  // just copy
        result+=c;
        break;
    }
  }
  result+='$'; // match end of input
  return result;
}

Referenced by reg::Ex::Ex().