This block allow you to replace some text by another one.

Let's say you want to replace cats by dogs in the text I love cats.

• text represents the text in which the replacement will occur (I love cats)
• old text represents the part of the text you want to replace (cats)
• new text represents the replacement text (dogs)
• replace all if true, replace all occurences of old text, otherwise just the first one

result contain the text after the replacement occured (here I love dogs).