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Thread: Simple regular expression test

  1. #1
    Join Date
    Nov 2011
    Posts
    2

    Question Simple regular expression test

    Hi. My problem is something that I am sure almost everyone here knows.
    Here we go:
    I want to check the regular expression. I have this form:

    <form name="registrace" method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>" onSubmit="return check(registrace);">

    Inside this form I have this input that represents year of born

    <input type="text" id="year" name="year" value='<?php if (isset($year)) { echo $year;}?>'></td>

    And now I want to check if user entered 4 numbers, i use javascript function:

    function check(form){
    var patt1=new RegExp(/(\d{4})/gm);
    if(patt1.test(form.year.value) ){
    /*this should return true when regular expression from form matches the pattern. but the condition - not working*/
    /*do nothing*/
    }
    else{
    document.getElementById('yearDiv').innerHTML = "Year of born must be four numbers. !!!";
    form.year.focus();
    return false;
    }
    }

    I need to figure out this condition that will work. I don't know how to say to javascript, that he write to the yearDiv when regular expression check fails.
    Any help would be appreciated.

  2. #2
    Join Date
    Oct 2010
    Location
    Versailles, France
    Posts
    1,290
    Code:
    document.forms["registrace"].year.value;
    or 
    document.forms[0].year.value;
    or 
    document.registrace.year.value;
    But not form.year.value

  3. #3
    Join Date
    Nov 2011
    Posts
    2

    Re:

    thanks,

    you right but "form" is actually argument of the check function and i give it the value "registrace" trough submitting form - onSubmit="return check(registrace)"

    so you suggest to type:
    document.form.year.value in condition if(patt1.test(document.form.year.value) ){

    bad news. the condition still not work

  4. #4
    Join Date
    Oct 2010
    Location
    Versailles, France
    Posts
    1,290
    Ok. I have not seen the argument nor the syntax for patt1
    Code:
    var patt1=/(\d){4}/gm;
    // or 
    var patt1=new RegExp("(\d{4})","gm");
    // but not 
    var patt1=new RegExp(/(\d{4})/gm);

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