The matchRow() method of p5.Table in p5.js is used to find the first row that matches the given regular expression and returns a reference to that row. The column that the method uses to search the row can be specified as a parameter. The method only returns the first row of the possible matches even if multiple matches of the regular expression exist.
Syntax:
matchRow( regexp, column )
Parameters: This method accepts two parameters as mentioned above and described below:
- regexp: It is a String or RegExp object that specifies the regular expression to match.
- column: It is a String or number that denotes the column name or ID of the column.
Return Value: This method returns a p5.TableRow object which matches the given regular expression.
The example below illustrates the match Row() method in p5.js:
Example:
function setup() {
createCanvas(500, 300);
textSize(16);
matchQueryInput = createInput();
matchQueryInput.position(30, 40);
getColBtn =
createButton( "Get the matching row" );
getColBtn.position(30, 70);
getColBtn.mouseClicked(getMatchResults);
// Create the table
table = new p5.Table();
// Add two columns
table.addColumn( "name" );
table.addColumn( "id" );
// Add some rows to the table
let newRow = table.addRow();
newRow.setString( "name" , "mary" );
newRow.setString( "id" , 21);
newRow = table.addRow();
newRow.setString( "name" , "marco6" );
newRow.setString( "id" , 27);
newRow = table.addRow();
newRow.setString( "name" , "tunisia 4" );
newRow.setString( "id" , 32);
newRow = table.addRow();
newRow.setString( "name" , "user 23" );
newRow.setString( "id" , 32);
newRow = table.addRow();
newRow.setString( "name" , "admin" );
newRow.setString( "id" , 45);
newRow = table.addRow();
newRow.setString( "name" , "mikasa" );
newRow.setString( "id" , 23);
showTable();
} function getMatchResults() {
clear();
let matchQuery =
matchQueryInput.value();
// Get the row values using matchRow()
if (matchQuery != "" ) {
// Match the query in the column of 'name'
matchResults =
table.matchRow( new RegExp(matchQuery),
"name" );
if (matchResults) {
text( "The row that matches the " +
"query is" , 20, 120);
// Display the matched value
text(matchResults.arr[0], 20, 140);
text(matchResults.arr[1], 120, 140);
} else text( "No Results Found" , 20, 120);
} else {
text( "The query string is empty" , 20, 120);
}
text( "Enter a string to find it in " +
"the 'name' column table" , 20, 20);
} function showTable() {
clear();
// Display the total rows present in the table
text( "There are " + table.getRowCount() +
" rows in the table" , 20, 120);
for (let r = 0; r < table.getRowCount(); r++)
for (let c = 0; c < table.getColumnCount(); c++)
text(table.getString(r, c),
20 + c * 100, 140 + r * 20);
text( "Enter a string to find it in " +
"the 'name' column table" , 20, 20);
} |
Output:
Environment Setup: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/amp/
Reference: https://p5js.org/reference/#/p5.Table/matchRow