p5.Table matchRows() Method

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The matchRows() method of p5.Table in p5.js is used to find all the rows that match the given regular expression. It returns a reference to the matched rows in the form of an array. The column that the method uses to search the row can be specified as a parameter.

Syntax:

matchRows( 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. It is an optional parameter.

Return Value: This method returns an array of p5.TableRow objects which match the given regular expression.

The example below illustrates the match Rows() 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(getMatchedResults); 
  
  // 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 getMatchedResults() { 
  clear(); 
  
  let matchQuery = 
      matchQueryInput.value(); 
  
  if (matchQuery != "") { 
  
    // Match the query in the column of 'name'  
    matchResults = 
      table.matchRows(new RegExp(matchQuery), 
                      'name'); 
    
    if (matchResults.length > 0) { 
      text("The rows that matches the " + 
           "query is", 20, 120); 
  
      for (let i = 0; i < matchResults.length; i++) { 
        // Display the matched value 
        text(matchResults[i].arr[0], 20, 140 + i * 20); 
        text(matchResults[i].arr[1], 120, 140 + i * 20); 
      } 
  
  
    } 
    else text("No Results Found", 20, 120); 
      
  } else { 
    text("The query string is empty", 20, 120); 
  } 
  text("Enter a string to match 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 match it in " +  
       "the 'name' column table", 20, 20); 
} 

Output:

Environment Setup: https://www.zambiatek.com/p5-js-soundfile-object-installation-and-methods/

Reference: https://p5js.org/reference/#/p5.Table/matchRows

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