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Home/ Questions/Q 4107546
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Editorial Team
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Editorial Team
Asked: May 20, 20262026-05-20T21:31:45+00:00 2026-05-20T21:31:45+00:00

How would i apply an if statement in an input field if i want

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How would i apply an if statement in an input field if i want the input to be exactly in MM/DD/YYYY format? Any other input that is different from this format i would echo out an error statement.

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  1. Editorial Team
    Editorial Team
    2026-05-20T21:31:46+00:00Added an answer on May 20, 2026 at 9:31 pm

    You could use a regular expresion for that:

    if (preg_match('#^\d\d/\d\d/\d\d\d\d$#', $str)) {
    

    The # are just preg_match delimiters. The ^ and $ mark start and end for the subject to match. And each \d is a placeholder which will match a decimal. The / are literal slashes which preg_match will test for.

    You could also add ( capture ) groups to test the individual decimal blocks for conformity. I would do that separately to check for alternating formats. But for your purposes, it could be:

    if (preg_match('#^(0\d|10|11|12)/([0-2]\d|30|31)/(19|20)\d\d$#', $str)) {
    
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