Form validation, regular expressions? Need 2 strings only

Question

I have a form that people must fill in. There has to be checks if the person filled in the form correctly. Now I need 2 type of checks but I have no clue how to accomplish this. I looked up regular expressions but I only get errors (deprecated??) and I am stuck on tutorials. What I need should be easy enough.

1) string may only contain letters and dots

2) string may only contain letters, dashes - and '

Who can help me?

Before looking for tutorials, look for the fantastic PHP manual: http://www.php.net/manual/en/intro.filter.php — hakre, Nov 30 '11 at 10:41

score 1 · Answer 1 · answered Nov 30 '11 at 10:41

1

are you using eregi? because that function is deprecated since php 5.3.0.

look this website: http://takien.com/513/how-to-fix-function-eregi-is-deprecated-in-php-5-3-0.php

answered Nov 30 '11 at 10:41

Stefan Koenen

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Yes in fact I did use eregi! Thanks for your comment. I'm going to check out that website. – 45808 Nov 30 '11 at 10:45

score 1 · Accepted Answer · answered Nov 30 '11 at 10:46

1

// (1)
if ( preg_match('/[^\w\.\']/u', $field1) )
    ... check one failed

// (2)
if ( preg_match('/[^\w]/u', $field2) )
    ... check two failed

// (3)
if ( preg_match('/[^\d]/', $field3) )
    ... check three failed

// (4)
if ( preg_match('/[^\w\d]/u', $field4) )
    ... check four failed

// (5) emails cannot be checked a 100% but ...
if ( !preg_match('/^(?:[0-9a-z\_\-]+\.?)+\@(?:[0-9a-z\-]+\.)+[a-z]{2,4}$/i', $field5) )
    ... check five failed

answered Nov 30 '11 at 10:46

aefxx

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Thank you. Number 1 and 2 aren't workin though. 1) I need a string that only allows letters and dots. 2) I only need to allow letters, dash - and ' . 3) I need one with letters only. Can you help me with these 3? – 45808 Nov 30 '11 at 11:06

score 0 · Answer 3 · edited May 23 '17 at 11:55

1) string may only contain letters, dots and ' (NOTE: I use mysql_real_escape_string) how do I solve this?

^[A-Za-z0-9.']+$

2) string may only contain letters

Regular Expression to match only letters

3) string may only contain numbers

Regex to match "{number}"

4) string may only contain letters and numbers

combine 2) and 3)

5) check for valid email address

Using a regular expression to validate an email address

Form validation, regular expressions? Need 2 strings only

3 Answers3