Regular Expression That Contains At Least One Of Each

regex at least one character
regex must contain
javascript regex
the set of strings over alphabet {a, b, c} with at least one a and at least one b.
the language of all strings containing exactly two as
regex lookahead
the language of all strings containing at least one 0 and at least one 1

I'm trying to capitalize "words" that have at least one number, letter, and special character such as a period or dash.

Things like: 3370.01b, 6510.01.b, m-5510.30, and drm-2013-c-004914.

I don't want it to match things like: hello, sk8, and mixed-up

I'm trying to use lookaheads, as suggested, but I can't get it to match anything.

$output = preg_replace_callback('/\b(?=.*[0-9]+)(?=.*[a-z]+)(?=.*[\.-]+)\b/i', function($matches){return strtoupper($matches[0]);}, $input);

Need a Regex that contains at least one number, zero or more , This is a typical password validation with your requirements. Note that this will also match 8-13 digits as well (but it is requested). Ten million +� Write a Java regular expression to match all strings that contain exactly five vowels and the vowels are in alphabetical order. Answer: [^aeiou]*a[^aeiou]*e[^aeiou]*i[^aeiou]*o[^aeiou]*u[^aeiou]* Write a Java regular expression to match valid Windows XP file names.

Regular expression:


PHP code:

$input = '3370.01b';
$output = preg_replace_callback('/(?=.*\d)(.*)([-.])(.*)/i', function($matches){return strtoupper($matches[0]);}, $input);

Quantifiers +, *, ? and {n}, Let's say we have a string like +7(903)-123-45-67 and want to find all numbers in it. Then a regexp \d{3,} looks for sequences of digits of length 3 or more: 100, 10 // 1 not matched, as 0+ requires at least one zero� Regular Expressions A password containing at least 1 uppercase, 1 lowercase, 1 digit, 1 special character and have a length of at least of 10 Example As the characters/digits can be anywhere within the string, we require lookaheads.

I don't think you never captured anything to put into matches...

$input = '3370.01b foo';
$output = preg_replace_callback('/(?=.*[0-9])(?=.*[a-z])(\w+(?:[-.]\w+)+)/i', function($matches){return strtoupper($matches[0]);}, $input);

echo $output;


3370.01B foo


Java regex program to verify whether a String contains at least one , Following regular expression matches a string that contains at least one alphanumeric characters −^.*[a-zA-Z0-9]+.*$;Where,^.* Matches the� Give regular expressions for the following languages on = {a, b, c}. All strings containing exactly one a. (b+c)*a(b+c)*. All strings containing no more than three a's. We can describe the string containing zero, one, two, or three a's(and nothing else) as. (+a)(+a)(+a)

REGEX password must contain letters a-zA-Z and at least one digit 0 , I didn't realize that the RegEx engine did look ahead. It's all over and I'm standin' pretty. In this dust that was a city. If I could find a souvenier. Just� Consider a simple regular expression that is intended to extract the last four digits from a string of numbers such as a credit card number. The version of the regular expression that uses the * greedy quantifier is \b.*([0-9]{4})\b. However, if a string contains two numbers, this regular expression matches the last four digits of the second

Regular Expressions, regex documentation: A password containing at least 1 uppercase, 1 of checking resets to the original position after each condition of lookahead is met. A regular expression (shortened as regex or regexp; also referred to as rational expression) is a sequence of characters that define a search pattern.Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation.

What is the regular expression for strings containing at least one a , The DFA of this language can be easily written. Apply state removal method to this machine, then you can receive a regular expression. I'm not convinced a regex is the best way to do this. Coming up with something to match only if there is at least one number and at least one uppercase letter may well be more trouble than it's worth. One of the regex wizards who post here may have a solution - but I couldn't think of one.

  • As per OP it should not match if the word contains only number and it should also contain an alphabet too.
  • Your solution also matches aaa-ddd 111-222 strings which according to OP shouldn't match as the word should contain at least a digit and an alphabet within the word. Check this