[ Solved -7 Answers] – How to remove non-alphanumeric characters from a string

PROBLEM:

• How to remove non-alphanumeric characters from a string

SOLUTION 1:

•  To remove non-alphanumeric characters from a string,first you need to basically defined it as a regex.

[pastacode lang=”javascript” manual=”preg_replace(%22%2F%5B%5EA-Za-z0-9%20%5D%2F%22%2C%20”%2C%20%24string)%3B%0A” message=”JAVASCRIPT CODE” highlight=”” provider=”manual”/]

SOLUTION 2:

• For unicode characters, we have to use the below example:

[pastacode lang=”javascript” manual=”%20preg_replace(%22%2F%5B%5E%5B%3Aalnum%3A%5D%5B%3Aspace%3A%5D%5D%2Fu%22%2C%20”%2C%20%24string)%3B%0A” message=”javascript code” highlight=”” provider=”manual”/] [ad type=”banner”]

SOLUTION 3:

• We can also use the regular expression.

   Here is an example:

[pastacode lang=”javascript” manual=”%24str%20%3D%20preg_replace(‘%2F%5B%5Ea-z%5Cd%20%5D%2Fi’%2C%20”%2C%20%24str)%3B%0A” message=”javascript code” highlight=”” provider=”manual”/]

we need to  note of the following

• The i stands for case insensitive.
• ^ means, does not start with.
• \d matches any digit.
• a-z matches all characters between a and z. Because of the i parameter you don’t have to specify a-z and A-Z.
• After \d there is a space, so spaces are allowed in this regex

SOLUTION 4:

• here’s a really simple regex for remove non-alpha numeric characters:

[pastacode lang=”javascript” manual=”%20%20%5CW%7C_%0A” message=”javascript code” highlight=”” provider=”manual”/]

and used as you need it (with a forward / slash delimiter).

[pastacode lang=”javascript” manual=”%20preg_replace(%22%2F%5CW%7C_%2F%22%2C%20”%2C%20%24string)%3B%0A” message=”javascript code” highlight=”” provider=”manual”/] [ad type=”banner”]

• Test it here with this great tool that explains what the regex is doing:

http://www.regexr.com/

SOLUTION 5:

• A PHP function that strips a string of all characters other than alphanumeric characters:

[pastacode lang=”javascript” manual=”function%20onlyAlphanumericAndSpaces(%24text)%20%0A%7B%0A%20%20%23%20allow%20only%20alphanumeric%0A%20%20return%20ereg_replace(%22%5B%5EA-Za-z0-9%20%5D%22%2C%20%22%22%2C%20%24text%20)%3B%0A%7D%0A” message=”javascript code” highlight=”” provider=”manual”/]

SOLUTION 6:

• We can also use the below code to Remove All Non-Numeric Characters

[pastacode lang=”javascript” manual=”%2F**%0A*%20Remove%20all%20characters%20except%20numbers.%0A*%0A*%20%40param%20string%20%24string%0A*%20%40return%20string%0A*%2F%0Afunction%20stripNonNumeric(%20%24string%20)%20%0A%7B%0A%20%20%20%20return%20preg_replace(%20%22%2F%5B%5E0-9%5D%2F%22%2C%20%22%22%2C%20%24string%20)%3B%0A%7D%0A” message=”javascript code” highlight=”” provider=”manual”/] [ad type=”banner”]

SOLUTION 7:

• This code will delete any non-alphanumeric characters specified between the brackets, and then output/return the clean version.

The code:

[pastacode lang=”php” manual=”%3C%3Fphp%20%24string%20%3D%20%22Here!%20is%20some%20text%2C%20and%20numbers%2012345%2C%20and%20symbols%20!%C2%A3%24%25%5E%26%22%3B%0A%24new_string%20%3D%20preg_replace(%22%2F%5B%5Ea-zA-Z0-9%5Cs%5D%2F%22%2C%20%22%22%2C%20%24string)%3B%0Aecho%20%24new_string%20%3F%3E%0A” message=”php code” highlight=”” provider=”manual”/]