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PHP Regular expression - Exercises, Practice, Solution

PHP regular expression [ 7 exercises with solution]

1. Write a PHP script that checks if a string contains another string. Go to the editor
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2. Write a PHP script that removes the last word from a string. Go to the editor
Sample string : 'The quick brown fox'
Expected Output : The quick brown
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3. Write a PHP script that removes the whitespaces from a string. Go to the editor
Sample string : 'The quick " " brown fox'
Expected Output : Thequick""brownfox
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4. Write a PHP script to remove nonnumeric characters except comma and dot. Go to the editor
Sample string : '$123,34.00A'
Expected Output : 12,334.00
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5. Write a PHP script to remove new lines (characters) from a string. Go to the editor
Sample strings : "Twinkle, twinkle, little star,\nHow I wonder what you are.\nUp above the world so high,\nLike a diamond in the sky.";
Expected Output : "Twinkle, twinkle, little star, How I wonder what you are. Up above the world so high, Like a diamond in the sky."
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6. Write a PHP script to extract text (within parenthesis) from a string. Go to the editor
Sample strings : 'The quick brown [fox].'
Expected Output : 'fox'
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7. Write a PHP script to remove all characters from a string except a-z A-Z 0-9 or " ". Go to the editor
Sample string : abcde$ddfd @abcd )der]
Expected Result :
abcdeddfd abcd der
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PHP Code Editor:

More to Come !

Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.



PHP: Tips of the Day

In PHP, there are two versions of logical AND and OR operators.

Operator True if
$a and $b Both $a and $b are true
$a && $b Both $a and $b are true
$a or $b Either $a or $b is true
$a || $b Either $a or $b is true

Note that the && and || opererators have higher precedence than and and or. See table below:

Evaluation Result of $e Evaluated as
$e = false || true True $e = (false || true)
$e = false or true False ($e = false) or true

Because of this it's safer to use && and || instead of and and or.