Some Regular expresstion

@themilad_comNov 14.2012

hi, i don’t know how write regexp (preg_match() in php) and i wanna following regexps:
1. just number
2. just words
3. just words, numbers, -._
tanks.

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PHP

@Sup3rkirbyNov 14.2012 — #

<i>
 </i>$reg1 = preg_match("/[0-9]/", "String to check");  // Only numbers
 $reg2 = preg_match("/[a-z]/i", "String to check");  // Only letters
 $reg3 = preg_match("/[a-z0-9-._]/i", "String to check");  // numbers, letters and -._

There are a few different ways to use those regular expressions but I laid out a simple preg_match function stored in each variable above.

@OctoberWindNov 15.2012 — #Those checks are all well and good, if all you want to know if is the string contains "a letter" , "a number" or "a letter, number, hyphen, period, or underscore".

I'm going to assume this is for validating some type of login or password?

If that's the case, you probably want to check for things OTHER than what you want.

Take a look at these examples:

[code=php]
  $test_string = "Str1ng-t0_ch3ck.";
 $test_string_words = "Stringtocheck";
 $test_string_numbers = "12345";
 $test_string_mixed = "Str1ng t0 ch3ck.";	// note the added spaces; need to add s to the regex patterns to match this
 
  $reg1 = preg_match("/[^0-9]/", $test_string);  // Only numbers
  $reg1a = preg_match("/[^0-9]/", $test_string_numbers);  // Only numbers
 
  $reg2 = preg_match("/[^a-z]/i", $test_string);  // Only letters
  $reg2a = preg_match("/[^a-z]/i", $test_string_words);  // Only letters
 
  $reg3 = preg_match("/[^a-z0-9-._]/i", $test_string);  // numbers, letters and -._
 
  $reg4 = preg_match("/[^w-._]/i", $test_string_mixed);  // numbers, letters and -._ 
 
 
  /*
  preg_match returns int(1) if it finds a match to the pattern or int(0) if it does not find a match.
  since these checks are checking for NOT IN THE PATTERN, then (if $var === 0) "passes" the regex and (if $var === 1) "fails"
   {three "equal signs" matches exactly the type int()} 
  ------------ reg1 (it found something other than just numbers)
  1
  ------------ 
  ------------ reg1a (it found only numbers)
 
  ------------ 
  ------------ reg2 (it found something other than just letters)
  1
  ------------ 
  ------------ reg2a (it found only letters)
 
  ------------ 
  ------------ reg3 (it found only the acceptable characters)
 
  ------------ 
  ------------ reg4 (condensed "word boundries (letter and numbers) plus the extra characters")
  1
  ------------ 
 
  */
 
 [/code]

@NogDogNov 15.2012 — #Also, please see the various ctype_*() functions for more efficient ways to do certain checks.

@themilad_comauthorNov 16.2012 — #i want check input and

1.if it was just numbers return 1 and if it has characters return 0.

2.if it was just characters return 1 and if it has numbers return 0.

3.if it was just characters and numbers return 1 and if it has else characters line &,*,... return 0.

3.if it was just characters and numbers and -_. return 1 and if it has else characters line &,*,... return 0.

Some Regular expresstion

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