Mukesh Chapagain's Blog » Regular Expression

PHP: How to get integer or decimal from a string?

Mukesh — Thu, 29 Apr 2010 13:32:43 +0000

Suppose, I have a string with text and number and I only want the number. I don’t want the characters and text of the string.

Here is the way out:-

In this example, you will get only integer. It will omit all characters and text from the string.

$string = 'Nrs 89,994,874.0098';
echo preg_replace("/[^0-9]/", '', $string);
// output: 899948740098

This example prints decimal numbers removing all the characters from the string.

$string = 'Nrs 89,994,874.0098';
echo preg_replace("/[^0-9\.]/", '', $string);
// output: 89994874.0098

Hope this helps.

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PHP: Simple and easy way to format URL string

Mukesh — Thu, 22 Apr 2010 15:06:11 +0000

Here, I will be showing you a simple and easy one line code to format URL string with PHP. By URL string, I mean the url key in any Search Engine Friendly URL.

I have used preg_replace function to do so.

preg_replace($pattern, $replacement, $string)

preg_replace function performs a regular expression search and replace. This will search subject for matches to pattern and replaces them with replacement.

Here is my code:-

$urlKey = preg_replace(array('/[^a-z0-9-]/i', '/[ ]{2,}/', '/[ ]/'), array(' ', ' ', '-'), $string);

e.g. http://example.com/my-planet-earth/

I am talking about formatting ‘my-planet-earth’. Here, $string can be ‘My Planet Earth’ and the $urlKey will be ‘my-planet-earth’

$string = "planet+*&john doe / / \ \ ^ 44 5 % 6 + - @ ku ! ~ ` this";
$urlKey = preg_replace(array('/[^a-z0-9-]/i', '/[ ]{2,}/', '/[ ]/'), array(' ', ' ', '-'), $string);
// outputs: planet-john-doe-44-5-6---ku-this

Hope this helps.

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Regular Expression check, Validation in PHP

Mukesh — Sun, 02 Mar 2008 06:36:08 +0000

In this article, you will find php validation code for:

1) Interger Validation

2) String Validation

3) Decimal Validation (two digits after decimal)

4) Email Validation


Invalid name: $name
";
}

//checking amount (decimal value, allowing only 2 digits after dot)
$check_amount = ereg('^[0-9]+(\.[0-9]{2})$',$amount);
if($check_amount == false)
{
echo "Invalid amount: $amount
";
}

//checking age (integer)
$check_age = ereg('^[0-9]+$',$age);
if($check_age == false)
{
echo "Invalid age: $age
";
}

//checking email
$check_email = ereg('[a-zA-Z0-9_.]+@[a-zA-Z]+(\.[a-zA-Z]{3}(\.[a-zA-Z]{2})?)?',$email);
if($check_email == false)
{
echo "Invalid email: $email
";
}

//if everything is valid
if($check_name != false && $check_age != false && $check_amount != false && $check_email != false)
{
echo "Everything is correct.";
echo "
";
echo "Name: $name";
echo "
";
echo "Age: $age";
echo "
";
echo "Amount: $amount";
echo "
";
echo "Email: $email";
echo "
";
echo "";
echo "
";
}

}
?>



Regular Expression Test






Name: 
Age: 
Amount:  (eg. 11.22)
Email:

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Fun with Regular Expression

Mukesh — Wed, 15 Aug 2007 05:36:12 +0000

Fun with perl regular expression

A) $st = “The programming republic of perl”;

$1 = ?, $2 = ? and $3 = ?

1) if($st =~/(.*)(e|r)(.*)$/)

2) if($st =~/(m{1,2})(.*)$/)

3) if($st =~/(.*)(m{1,2})(.*)$/)

4) if($st =~/(.?)(m{1,2})(.*)$/)

5) if($st =~/(.+?)(e|r)(.*)$/)

6) if($st =~/(m{1,2}?)(.*?)$/)

7) if($st =~/(m{1,2}?)(.*?)/)

8 ) if($st =~/(.*})(.*)$/)

Answer:

1) $1 = The programming republic of pe $2 = r $3 = l

2) $1 = mm $2 = ing republic of perl $3 = -

3) $1 = The program $2 = m $3 = ing republic of perl

4) $1 = a $2 = mm $3 = ing republic of perl

5) $1 = Th $2 = e $3 = programming republic of perl

6) $1 = m $2 = ming republic of perl $3 = -

7) $1 = m $2 = - $3 = -

8 ) $1 = The programming republic of perl $2 = - $3 = -

B) $st = “Mississippi made a hissing sound”;

$1 = ?, $2 = ? and $3 = ?

1) if($st =~/(.*)(i|s)(.*)$/)

2) if($st =~/(s{1,2})(.*)$/)

3) if($st =~/(.*)(s{1,2})(.*)$/)

4) if($st =~/(.?)(s{1,2})(.*)$/)

5) if($st =~/(.+?)(i|s)(.*)$/)

6) if($st =~/(s{1,2}?)(.*?)$/)

7) if($st =~/(s{1,2}?)(.*?)/)

8 ) if($st =~/(.*})(.*)$/)

Answer:

1) $1 = Mississippi made a hissing $2 = s $3 = ound

2) $1 = ss $2 = issippi made a hissing sound $3 = -

3) $1 = Mississippi made a hissing $2 = s $3 = ound

4) $1 = i $2 = ss $3 = issippi made a hissing sound

5) $1 = m $2 = i $3 = ssissippi made a hissing sound

6) $1 = s $2 = sissippi made a hissing sound $3 = -

7) $1 = s $2 = - $3 = -

8 ) $1 = Mississippi made a hissing sound $2 = - $3 = -

C) $st = “Yahoo shooting hotmail semeeingly”;

$1 = ?, $2 = ? and $3 = ?

1) if($st =~/(.*)(h|o)(.*)$/)

2) if($st =~/(o{1,2})(.*)$/)

3) if($st =~/(.?)(e{1,2})(.*)$/)

4) if($st =~/(e{1,2}?)(.*?)$/)

Answer:

1) $1 = Yahoo shooting h $2 = o $3 = tmail semeeingly

2) $1 = oo $2 = shooting hotmail semeeingly $3 = -

3) $1 = s $2 = e $3 = meeingly

4) $1 = e $2 = meeingly $3 = -

D) $st = “zzen zest zzep zzengz”;

$1 = ?, $2 = ? and $3 = ?

1) if($st =~/(.*)(z|e)(.*)$/)

2) if($st =~/(z{1,2})(.?)(.*)$/)

3) if($st =~/(.*)(z{1,2})(.*)$/)

4) if($st =~/(.+?)(z|e)(.*)$/)

5) if($st =~/(z{1,2}?)(.*?)$/)

Answer:

1) $1 = zzen zest zzep zzeng $2 = z $3 = -

2) $1 = zz $2 = e $3 = n zest zzep zzengz

3) $1 = zzen zest zzep zzeng $2 = z $3 = -

4) $1 = z $2 = z $3 = en zest zzep zzengz

5) $1 = z $2 = - $3 = -

E) $test = “Communication comparison ammplification,”

$1 = ?, $2 = ? and $3 = ?

1) if($test =~/(.*)(m{1,2})(.*)/)

2) if($test =~/(.*?)(.*)/)

3) if($test =~/(.?)(m|p)(.*)/)

4) if($test =~/(.?)(^m|p)(.*?)/)

Answer:

1) $1 = Communication comparison am $2 = m $3 = plification,

2) $1 = $2 = Communication comparison amplification, $3 =

3) $1 = o $2 = m $3 = munication comparison amplification,

4) $1 = m $2 = p $3 =

F) $ip = “progra0mming456!is-+?fun!”

a) $ip =~tr/A-z/*/s;

b) $ip =~tr/A-z/ /cs;

c) $ip =~tr/A-z//sc;

Find the value of a),b) and c).

Answer:

a) $ip = *0*456!*-?*!

b) $ip = progra mming is fun

c) $ip = progra0mming456!is-+?fun!

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