import com.spire.presentation.*;
import com.spire.presentation.drawing.FillFormatType;

import java.awt.*;

public class ChangeFontStyles {

    public static void main(String[] args) throws Exception {

        //Create a Presentation object
        Presentation presentation = new Presentation();

        //Load the sample PowerPoint file
        presentation.loadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pptx");

        //Get the text shape
        IAutoShape shape = (IAutoShape) presentation.getSlides().get(0).getShapes().get(0);

        //Get the first paragraph and change the font color of it
        ParagraphEx paragraph = shape.getTextFrame().getParagraphs().get(0);
        PortionEx textRange =  paragraph.getFirstTextRange();
        textRange.getFormat().getFill().setFillType(FillFormatType.SOLID);
        textRange.getFormat().getFill().getSolidColor().setColor(Color.blue);

        //Get the second paragraph and make the text bold, italic and unlined
        paragraph = shape.getTextFrame().getParagraphs().get(1);
        textRange = paragraph.getFirstTextRange();
        textRange.getFormat().isBold(TriState.TRUE);
        textRange.getFormat().isItalic(TriState.TRUE);
        textRange.getFormat().setTextUnderlineType(TextUnderlineType.DASHED);

        //Get the third paragraph and change the font name and size
        paragraph = shape.getTextFrame().getParagraphs().get(2);
        textRange = paragraph.getFirstTextRange();
        textRange.getFormat().setLatinFont(new TextFont("Segoe Print"));
        textRange.getFormat().setFontHeight(22f);

        //Save the document
        presentation.saveToFile("output/ChangeFontStyles.pptx", FileFormat.PPTX_2013);
    }
}

using Spire.Presentation;
using System.Text.RegularExpressions;

namespace ReplaceTextWithRegex
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Presentation instance
            Presentation ppt = new Presentation();
            //Load a sample document
            ppt.LoadFromFile("Sample.pptx");

            //Get the first slide
            ISlide slide = ppt.Slides[0];

            //Replace "ABC" and the subsequent to the end of the line as "ABC DEF"
            Regex regex = new Regex("ABC.*");
            string newvalue = "ABC DEF";
            foreach (IShape shape in slide.Shapes)
            {
                shape.ReplaceTextWithRegex(regex, newvalue);
            }

            //Save the result document
            ppt.SaveToFile("ReplaceTextWithRegex.pptx", FileFormat.Pptx2013);
        }
    }
}

Imports Spire.Presentation
Imports System.Text.RegularExpressions

Namespace ReplaceTextWithRegex
    Friend Class Program
        Private Shared Sub Main(ByVal args As String())
            'Create a Presentation instance
            Dim ppt As Presentation = New Presentation()
            'Load the sample document
            ppt.LoadFromFile("Sample.pptx")

            'Get the first slide
            Dim slide As ISlide = ppt.Slides(0)

            'Replace "ABC" and the subsequent to the end of the line as "ABC DEF"
            Dim regex As Regex = New Regex("ABC.*")
            Dim newvalue As String = "ABC DEF"

            For Each shape As IShape In slide.Shapes
                shape.ReplaceTextWithRegex(regex, newvalue)
            Next

            'Save the result document
            ppt.SaveToFile("ReplaceTextWithRegex.pptx", FileFormat.Pptx2013)
        End Sub
    End Class
End Namespace

import com.spire.presentation.*;
import com.spire.presentation.Presentation;
import com.spire.presentation.drawing.*;

import java.awt.*;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;


//Create a Presentation object
Presentation presentation = new Presentation();

//Load the sample PowerPoint file
presentation.loadFromFile("C:\\Users\\Administrator\\Desktop\\Spire.Presentation.pptx");

//Specify watermark text
String watermarkText = "E-iceblue";

//Get the size of the watermark text
Image image = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = (Graphics2D) image.getGraphics();
Font font = new Font("Arial", Font.BOLD, 20);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
Rectangle2D strSize = fm.getStringBounds(watermarkText, g2d);

//Initialize x and y coordinate
float x = 30;
float y = 80;

for (int rowNum = 0; rowNum < 4; rowNum++) {
    for (int colNum = 0; colNum < 5; colNum++) {

        //Add a rectangle shape
        Rectangle2D rect = new Rectangle2D.Float(x, y, (float) strSize.getWidth() + 10, (float) strSize.getHeight());
        IAutoShape shape = presentation.getSlides().get(0).getShapes().appendShape(ShapeType.RECTANGLE, rect);

        //Set the style of the shape
        shape.getFill().setFillType(FillFormatType.NONE);
        shape.getShapeStyle().getLineColor().setColor(new Color(1, 1, 1, 0));
        shape.setRotation(-45);
        shape.getLocking().setSelectionProtection(true);
        shape.getLine().setFillType(FillFormatType.NONE);

        //Add watermark text to the shape
        shape.getTextFrame().setText(watermarkText);
        PortionEx textRange = shape.getTextFrame().getTextRange();

        //Set the style of the text range
        textRange.getFill().setFillType(FillFormatType.SOLID);
        textRange.getFill().getSolidColor().setColor(Color.pink);
        textRange.setLatinFont(new TextFont(font.getName()));
        textRange.setFontMinSize(font.getSize());

        x += (100 + strSize.getWidth());

    }
    x = 30;
    y += (100 + strSize.getHeight());
}

//Save the document
presentation.saveToFile("output/Watermark.pptx", FileFormat.PPTX_2013);