Jquery: Find Text and replace

$("#id1 p:contains('dog')").html("doll");

that'll do it.

http://jsfiddle.net/pgDFQ/

try this,

$('#id1').html($('#id1').html().replace('dogsss','dollsss'));

working sample

You can use .each() to loop through the <p> elements, and .text() to update the text.

For example:

$('#id1 p').each(function() {
    // get element text
    var text = $(this).text();
    // modify text
    text = text.replace('dog', 'doll');
    // update element text
    $(this).text(text); 
});

Demo: https://jsfiddle.net/8gra4xjw/

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[Updated to reflect comments]

Note: The above replaces the first occurrence of 'dog' only. To replace all occurrences, you could use:

// modify text (replace all)
text = text.replace(/dog/g, 'doll');

See also: How to replace all occurrences of a string in JavaScript

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If the new text must contain HTML entities like  , you could use:

// update element text (html)
$(this).html(text);

See also: What is the difference between jQuery: text() and html() ?