constraints.checkPattern

Search for pattern matches (value) within a character vector (constraint).
A regular expression is used to test field values. 
If the regular expression matches then the value is valid. 
The values of this field <code>MUST</code> conform to the standard 
<a href="http://www.w3.org/TR/xmlschema-2/#regexs">XML Schema regular expression syntax</a>.

Allows to work with 'Table Schema' (<https://specs.frictionlessdata.io/table-schema/>). 'Table Schema' is well suited for use cases around handling and validating tabular data in text formats such as 'csv', but its utility extends well beyond this core usage, towards a range of applications where data benefits from a portable schema format. The 'tableschema.r' package can load and validate any table schema descriptor, allow the creation and modification of descriptors, expose methods for reading and streaming data that conforms to a 'Table Schema' via the 'Tabular Data Resource' abstraction.

Kleanthis Koupidis

tableschema.r

Table Schema 'Frictionless Data'

Lazaros Ioannidis

Charalampos Bratsas

Open Knowledge International 

constraints.checkPattern function

<dl><dt>constraint</dt>
<dd>character vector where matches are sought</dd>
<dt>value</dt>
<dd>character string to be matched</dd></dl>

Arguments

Search for pattern matches (value) within a character vector (constraint).
A regular expression is used to test field values. 
If the regular expression matches then the value is valid. 
The values of this field <code>MUST</code> conform to the standard 
<a href='http://www.w3.org/TR/xmlschema-2/#regexs'>XML Schema regular expression syntax</a>.

Pattern matching — constraints.checkPattern

<dl>

<dt>constraint</dt>
<dd>character vector where matches are sought</dd>


<dt>value</dt>
<dd>character string to be matched</dd>

</dl>

constraints.checkPattern: Pattern matching

Description

Usage

Value

Arguments

See Also

Examples