# Class RegexPattern.Groups

OptimaJet.Workflow.Core.CodeActions.RegexPattern.Groups

Contains named groups and fragments used to compose placeholder-matching regular-expression patterns.

Namespace: [OptimaJet.Workflow.Core.CodeActions](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/)

```csharp
public static class RegexPattern.Groups
```

## Fields

`public const string ParameterName = "(?<ParameterName>(?(MaybeWithBracket)[\\w ]+(\\.[\\w ]+)*|\\w+(\\.\\w+)*))"` 

Gets a named-group fragment that captures the parameter name part.

### Example

In input like `@document.Employee.Amount:format` or `@(document.Employee.Amount:format)`, this fragment captures `document.Employee.Amount` as a named group.

`public const string FindParameter = "(?<FindParameter>(?<MaybeWithBracket>@\\()|(?<WithoutBracket>(?<=[^\\w]|^|\\\\n)@))"` 

Gets a named-group fragment that detects a parameter prefix.

### Remarks

This fragment matches either `@(` from [RegexPattern.Groups.MaybeWithBracket](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/RegexPattern.Groups/) or an unparenthesized `@` from [RegexPattern.Groups.WithoutBracket](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/RegexPattern.Groups/), and stores the result as a named group.

`public const string MaybeWithBracket = "(?<MaybeWithBracket>@\\()"` 

Matches the opening bracketed prefix sequence `@(`.

`public const string EndWithBracketIfExists = "(?<EndWithBracketIfExists>(?(MaybeWithBracket)\\)|))"` 

Conditionally matches a closing parenthesis when `@(` was matched.

`public const string WithoutBracket = "(?<WithoutBracket>(?<=[^\\w]|^|\\\\n)@)"` 

Matches an unparenthesized `@` marker at the start of the input or when it is not immediately preceded by a word character.

`public const string MaybeExistsFormat = "((?<MaybeExistsFormat>:(?!\\s*@))|())"` 

Captures an optional `:` delimiter that begins a format specifier.

### Remarks

The delimiter is not captured when it is followed by optional whitespace and another `@` marker. An empty format after the delimiter is permitted.

`public const string Format = "(?<Format>(?(MaybeExistsFormat)(?(MaybeWithBracket)([^\"'()]|(?<=\\\\)(\\(|\\)|\\\"|'))*|[^\\(\\)\\{\\}\\[\\]\\s\\\"']*)|))"` 

Gets a named-group fragment that captures the format value when it is present.

### Remarks

This fragment is applied only when [RegexPattern.Groups.MaybeExistsFormat](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/RegexPattern.Groups/) is present.

`public const string MaybeWithQuotes = "(?:((?<MaybeWithSingleQuote>\\')|())|((?<MaybeWithDoubleQuote>\\\")|()))"` 

Captures an optional opening single or double quote before the [RegexPattern.Parameter](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/RegexPattern/) pattern.

`public const string EndWithQuotesIfExists = "(?<EndWithQuotesIfExists>(?(MaybeWithDoubleQuote)\\\"|(?<EndWithQuotesIfExists>(?(MaybeWithSingleQuote)\\'|))))"` 

Captures an optional closing quote that matches the quote captured by [RegexPattern.Groups.MaybeWithQuotes](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/RegexPattern.Groups/).

## Remarks

Update group names and related pattern fragments together to keep references in consuming expressions valid.

[Previous RegexPattern](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/RegexPattern/) [Next SubprocessNameGetterInvoker](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/SubprocessNameGetterInvoker/)