I need to validate a code format:
and I write:
<input maxlength="200" type="text" name="code" id="code" required="required" class="form-control input-lg" pattern="[a-fA-F0-9]{10}" title="Wrong Code" placeholder="Security Code" />
so my pattern is pattern="[a-fA-F0-9]{10}" but HOW I can add rules that at least 1 letter from a-f is required?
You could use a positive lookahead (?= to assert that what follows contains at least 1 occurance of [a-fA-F]
Updated version suggested by Wiktor Stribiżew
(?=[0-9]*[a-fA-F])[a-fA-F0-9]{10}
Explanation about the positive lookahead (?=[0-9]*[a-fA-F])
(?: Non capturing group
[0-9]* Match zero or more times a digit[a-fA-F] Match a-f in lower or uppercase) Close non capturing group<form>
<input maxlength="200" type="text" name="code" id="code" required="required" class="form-control input-lg" pattern="(?=[0-9]*[a-fA-F])[a-fA-F0-9]{10}" title="Wrong Code" placeholder="Security Code" />
<input type="submit" name="submit">
</form>
(?=[0-9]*[a-fA-F])[a-fA-F0-9]{10} will be faster.
Regex pattern to match at least 1 number and 1 character in a string
/^(?=.*[0-9])(?=.*[a-zA-Z])([a-zA-Z0-9]+)$/
Look at the regex in this thread, it should fit your needs. You need to replace your pattern with it.
try this one
<form action="/action_page.php">
<input type="text" name="code" id="code" required="required" class="form-control input-lg" pattern="(?=[a-fA-F0-9]*[a-fA-F])[a-fA-F0-9]{10}" title="Wrong Code" placeholder="Security Code" />
<input type="submit">
</form>
<b>
<pre>
1)Need to be 10 characters
2)A mix of letters and numbers
3)At least 1 letter from a-f
</pre></b>There is already an accepted answer, but that one is not complete.
The requirements state that there needs to be "A mix of letters and numbers" and "At least 1 letter from a-f". That would mean that these entries below would match as well:
8adfl9542a
m0ammmmmmm
11111a1111
They do not match in the accepted answer. I created my own regex which shows that the above entries match as well:
(?=.*[a-fA-F]+)(?=.*[0-9]+)[a-zA-Z0-9]{10}
Explanation:
(?=.*[a-fA-F]+) Match at least one character from a-f (upper- or lowercase)
(?=.*[0-9]+) Match at least one number
[a-zA-Z0-9]{10} Total string must be 10 characters long and must consist of characters from a-z (upper- or lowercase) or numbers
