How to check whether a variable contains consecutive letters, all uppercase letters or all lowercase letters?

How to check whether a variable contains consecutive letters, all uppercase letters or all lowercase letters $ str = & quot; ads sends a lsd to lose weight at home and falls in love with sdafgdsfghfdghjgfjghjgfhj Fang Saada waste Shita. by law 48955235 Sada waste where local teachers will immediately learn & quot; $ p = & quot; /\ d {5}/I & qu how to query a variable containing consecutive letters, all uppercase letters or all lowercase letters
$ Str = "ads sends a lsd to lose weight at home and falls in love with sdafgdsfghfdghjgfjghjgfhj Fang Saada, waste of Shi Dafu, and get to know about it immediately after being wasted by law 48955235 Sada ";
$ P = "/\ d {5}/I ";

Preg_match_all ($ p, $ str, $ result );
Var_dump ($ result );
The above five consecutive numbers can be found. if you change the number to a letter, how do you write the regular expression? check whether the number of digits in the letter (all in lower case or all in upper case) is unlimited.


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/[A-z] | [A-Z] + // or [a-z]/I
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Correct:/[a-z] +/I
The above is case insensitive.
/[A-z] +/
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$ P = "/[a-z] {5,}/I ";
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Wrong. Try this way.
$ P = "/[a-z] {5,} | [A-Z] {5 ,}/";
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What does the author mean by "no limit on the number of digits"? it can be 0, that is:/[a-z] */
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All in upper or lower case is:/([a-z] *) | ([A-Z] *)/
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There is no limit to the number of digits in the query (all in lower case or all in upper case)
All in lower case/[a-z] +/
All uppercase/[A-Z] +/

No, it must be wrong, so it cannot be *

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$ P = "/[A-z] + /";
Uppercase and lowercase letters for A-z matching
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