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Php – How to trim string before any special character

I’m receiving a string from user for fields lable that can contain special characters and HTML tag as well.

Examples:
  1. How will you be attending the event?
  2. select Education Level <i>some instruction</i>

I want to trim the string before any special character. How can it do?

Note: there is no specified special character list. excluded characters are _,-, +. Users can provide any of the characters they desire. But we can target commonly used special characters $%&*()}{@#~?><,|= those are used in questionnaire/instruction statements.

Desire Output:
  1. How will you be attending the event
  2. select Education Level
Tags:

3

Answers


  1. Chosen as BEST ANSWER
    0

    I used regex expression. It worked for me.

    if (preg_match('/['^£$%&*()}{@#~?><,|=+¬-]/', $str)) {
   $str = preg_split('/['^£$%&*()}{@#~?><,|=+¬-]/', $str)[0];
}
    Explanation:
    1. In the if condition, I'm checking the special characters existence within the string.
    2. If found, then splitting the string into an array.
    3. array index 0 contains a string before the special character and its an expected result.

    If anyone has any suggestions plz let me know.


  2. 0

    Try:

    h*[$%&*()}{@#~?><,|=].*$

    and replace with an empty string.

    See:
    https://regex101.com/r/tWqcfr/latest
    https://3v4l.org/lPNUs

    Explaination:

    Match what you do not need and throw it away

    • h* Optionally match any leading horizontal whitespace before …
    • [$%&*()}{@#~?><,|=] …encoundtering a special symbol…
    • .*$ …and match the rest of the string.
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  3. 0

    Try this simple example (demo – https://3v4l.org/tYvI1):

    preg_match('/^[ws+-]+/', 'select Education Level <i>some instruction</i>', $matches);
echo $matches[0];
    1. [ws+-] – means any letter, digit, space, _, -, +
    2. ^ – start of the row
        • one or more
          So you will get all words since start row to any special symbol to $matches array. Obviously the array will have onle one element in your case because of the "start row" condition.

    Best regards,
    Anton

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