internal RegExBuilderOptions(RegExBuilder regExBuilder, StringBuilder regExStream)
{
_regExBuilder = regExBuilder;
_regExStream = regExStream;
_enables = new List <char>();
_disables = new List <char>();
}
/// <summary>
/// Matches a bell character "\u0007". output=\a
/// </summary>
public RegExBuilder Choice(RegExBuilder firstChoice, RegExBuilder secondChoice, params RegExBuilder[] additionalChoices)
{
AddToStreamReturnQuantifiers($"({firstChoice}|{secondChoice}");
foreach (RegExBuilder choice in additionalChoices)
{
AddToStreamReturnQuantifiers($"|{choice}");
}
AddToStreamReturnQuantifiers(")");
return(this);
}
/// <summary>
/// Execute the <value>subExpression</value> with this confirguration.
/// </summary>
/// <returns>(?imnsx-imnsx:<value>subExpression</value>)</returns>
public RegExBuilder Finish(RegExBuilder subExpression)
{
_regExStream.Append($"(?");
_regExStream.Append(_enables);
if (_disables.Any())
{
_regExStream.Append('-');
}
_regExStream.Append(_disables);
_regExStream.Append($":{subExpression})");
return(_regExBuilder);
}
/// <summary>
/// Zero-width positive lookahead assertion.
/// </summary>
/// <example>
/// Pattern: \b\w+\b(?=.+and.+)
/// Expected result: matches "cats", "dogs" in "cats, dogs and some mice."
/// </example>
/// <param name="subExpression">The subexpression to be matched</param>
/// <returns>(?={subExpression})</returns>
public RegExBuilderQuantifiers PositiveLookAhead(RegExBuilder subExpression) => AddToStreamReturnQuantifiers($"(?={subExpression.Build()})");
/// <summary>
/// Defines a noncapturing group.
/// </summary>
/// <example>
/// Pattern: Write(?:Line)?
/// Expected result: matches "WriteLine" in "Console.WriteLine()" and "Write" in "Console.Write(value)"
/// </example>
/// <param name="subExpression">The subexpression that must be matched but not captured</param>
/// <returns>(?:{subExpression})</returns>
public RegExBuilderQuantifiers NonCaptureGroup(RegExBuilder subExpression) => AddToStreamReturnQuantifiers($"(?:{subExpression.Build()})");
/// <summary>
/// A balancing group definition deletes the definition of a previously defined group and stores, in the current group,
/// the interval between the previously defined group and the current group.
/// The balancing group definition deletes the definition of name2 and stores the interval between name2 and name1 in name1.
/// If no name2 group is defined, the match backtracks. Because deleting the last definition of name2 reveals the previous definition
/// of name2, this construct lets you use the stack of captures for group name2 as a counter for keeping track of nested constructs
/// such as parentheses or opening and closing brackets.
/// The balancing group definition uses name2 as a stack.
/// The beginning character of each nested construct is placed in the group and in its Group.Captures collection.
/// When the closing character is matched, its corresponding opening character is removed from the group, and the Captures
/// collection is decreased by one.After the opening and closing characters of all nested constructs have been matched, name2 is empty.
/// </summary>
/// <seealso cref="https://docs.microsoft.com/en-us/dotnet/standard/base-types/grouping-constructs-in-regular-expressions#balancing_group_definition"/>
/// <example>
/// Pattern: (((?'Open'\()[^\(\)]*)+((?'Close-Open'\))[^\(\)]*)+)*(?(Open)(?!))$
/// Expected result: matches "((1-3)*(3-1))" in "3+2^((1-3)*(3-1))"
/// </example>
/// <param name="subExpression">The subexpression to be captured</param>
/// <param name="name1">The name of the current group.</param>
/// <param name="name2">The name of a previously defined group.</param>
/// <param name="useSingleQuotesInsteadOfBrackets">If <value>true</value> will use single quotes instead of brackets to define the group name</param>
/// <returns>(?<{name1}-{name2}>{subExpression}) or (?'{name1}-{name2}'{subExpression}) if <value>useSingleQuotesInsteadOfBrackets</value> is <value>true</value></returns>
public RegExBuilderQuantifiers BalancingGroup(RegExBuilder subExpression, string name1, string name2, bool useSingleQuotesInsteadOfBrackets = false)
=> AddToStreamReturnQuantifiers(useSingleQuotesInsteadOfBrackets
? $"(?<{name1}-{name2}>{subExpression.Build()})"
: $"(?'{name1}-{name2}'{subExpression.Build()})");
/// <summary>
/// Atomic group.
/// </summary>
/// <example>
/// Pattern 1: (?>a|ab)c
/// Expected result 1: matches "ac" in"ac". Matches nothing in"abc".
///
/// Pattern 2: (?>ab|a)c
/// Expected result 2: matches "ac" in"ac" and "abc" in "abc". Matches nothing in"ab".
/// </example>
/// <param name="subExpression">The subexpression to be captured</param>
/// <returns>(?>{subExpression})</returns>
public RegExBuilderQuantifiers AtomicGroup(RegExBuilder subExpression) => AddToStreamReturnQuantifiers($"(?>{subExpression.Build()})");
/// <summary>
/// Zero-width negative lookbehind assertion.
/// </summary>
/// <example>
/// Pattern 1: \b\w+\b(?<!.+and.+)
/// Expected result 1: matches "cats", "dogs", "and" in "cats, dogs and some mice."
///
/// Pattern 2: \b\w+\b(?<!.+and.*)
/// Expected result 2: matches "cats", "dogs" in "cats, dogs and some mice."
/// </example>
/// <param name="subExpression">The subexpression to be matched</param>
/// <returns>(?<!{subExpression})</returns>
public RegExBuilderQuantifiers NegativeLookBehind(RegExBuilder subExpression) => AddToStreamReturnQuantifiers($"(?<!{subExpression.Build()})");
/// <summary> /// Matches any lower case letter (A to Z). /// </summary> /// <param name="regex"></param> /// <returns>[a-z]</returns> public static RegExBuilder LetterLowerCase(this RegExBuilder regex) => regex.AddToStreamReturnQuantifiers(@"[a-z]");
/// <summary> /// Matches any letter (A to Z), case insensitive. /// </summary> /// <returns>[a-zA-Z]</returns> public static RegExBuilder LetterCaseInsensitive(this RegExBuilder regex) => regex.AddToStreamReturnQuantifiers(@"[a-zA-Z]");
/// <summary> /// Matches a new line with an optional carriage return. /// </summary> /// <returns>\r?\n</returns> public static RegExBuilder NewlineWithOptionalCarriageReturn(this RegExBuilder regex) => regex.AddToStreamReturnQuantifiers(@"\r?\n");
/// <summary>
/// The match must occur on a boundary between the two "\B" but does not match the anchor characters at the begin and end.
/// </summary>
/// <example>
/// Pattern: \B\w+\s\w+\B
/// Expected behavior: The match must occur on a boundary between a \w (alphanumeric) and another \w (alphanumeric) characters.
/// Expected result: "hem theme them the" in "them theme them them"
/// </example>
/// <param name="regExBuilder">The regular expression pattern that needs to be matched inside de boundary</param>
/// <returns>\B<value>regExBuilder</value>\B</returns>
public RegExBuilder BoundaryExcludeStartAndEndCharacters(RegExBuilder regExBuilder) => AddToStreamReturnQuantifiers($@"\B{regExBuilder.Build()}\B");
/// <summary>
/// The match must occur on a boundary between the two "\b".
/// </summary>
/// <example>
/// Pattern: \b\w+\s\w+\b
/// Expected behavior: The match must occur on a boundary between a \w (alphanumeric) and another \w (alphanumeric) characters.
/// Expected result: "them theme", "them them" in "them theme them them"
/// </example>
/// <param name="regExBuilder">The regular expression pattern that needs to be matched inside de boundary</param>
/// <returns>\b<value>regExBuilder</value>\b</returns>
public RegExBuilder Boundary(RegExBuilder regExBuilder) => AddToStreamReturnQuantifiers($@"\b{regExBuilder.Build()}\b");
