Exercise 21.1<br/>
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Write a regular expression that looks for the following words in a phrase and displays a message to say if any of the phrases exist in the string.<br/><br/>

cow<br/>
pig<br/>
horse<br/>


<br/>matches found<br/>cow


<br/><br/>
Exercise 21.2<br/>
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Write a regular expression that counts the number of words in a phrase.<br/><br/>


Number of works : 3

<br/><br/>
Exercise 21.3<br/>
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<br/>
Divide a sentence into words.


php<br/>regular<br/>expressions<br/>