www.webdeveloper.com
Results 1 to 7 of 7

Thread: Need help with REGEX

  1. #1
    Join Date
    Nov 2010
    Posts
    62

    Need help with REGEX

    Hi everyone.

    I am setting up a password validation script.
    I have spent a while trying to understand how to create my own regular expression but I'm not winning here!

    Could someone help me?

    The requirements are
    Password must contain:

    At least 1 Uppercase Character
    At least 1 Lowercase Character
    At least 1 numeric Character
    The string length must be 8-16.

    Thanks in advance

  2. #2
    Join Date
    Oct 2010
    Location
    Ohio
    Posts
    233
    PHP Code:
    <?php

    $req_char 
    TRUE;
    $patterns = array("|[a-z]+|","|[A-Z]+|","|[0-9]+|");
    foreach( 
    $patterns as $pattern ) {
       if( !
    preg_match($pattern,$password) > ) {
          echo 
    $pattern .'failed<br />';
          
    $req_char FALSE;
       }
    }
    if( 
    $req_char && strlen($password) >= && strlen($password) <= 16 ) {
       echo 
    "password is acceptable";
    } else {
       echo 
    "password fails";
    }
    Best I could come up with.
    ~Ryan
    www.rdennispallas.com <-- Personal Site, changing regularly cuz its ugly.

  3. #3
    Join Date
    Oct 2010
    Location
    Ohio
    Posts
    233
    Found this pattern googling that does the same:
    PHP Code:
    $pattern "((?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,16})";
    if( 
    preg_match($pattern,$password) ) {
       echo 
    "Valid Password";
    } else {
       echo 
    "Invalid Password";

    ~Ryan
    www.rdennispallas.com <-- Personal Site, changing regularly cuz its ugly.

  4. #4
    Join Date
    Nov 2010
    Posts
    62
    Thanks I will give that a go soon

  5. #5
    Join Date
    Nov 2010
    Posts
    62
    Hi there.

    it works but my password field is also allowed special character (but they are optional).

    Thanks

  6. #6
    Join Date
    Aug 2004
    Location
    Ankh-Morpork
    Posts
    22,330
    Quote Originally Posted by pedro93 View Post
    Hi there.

    it works but my password field is also allowed special character (but they are optional).

    Thanks
    Here's a modified version of post #3 to allow for specifying which special characters are allowed:
    PHP Code:
    <?php
    function isValidPwd($password)
    {
       
    /*
        * Change the characters between the [] brackets to desired values
        * hyphen "-" should be last, if used
        * escape "[" or "]" with "\"
        */
       
    $allowedSpecialChars '[\[\]_*%-]';

       
    $allChars "(\w|$allowedSpecialChars)";
       
    $pattern '/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])'.$allChars.'{8,16}$/';
       return (
    preg_match($pattern$password));
    }

    //TEST:
    $passwords = array(
       
    'abCD12-['// valid
       
    'Ab12*-xx'// valid
       
    'Ab!@2345'// invalid special characters
       
    'Ba1-',     // too short
       
    'B1a-xxx_xxxxxxxxxxxxxxxx'// too long
       
    '1axxxx---',// no upper-case
       
    '1Baxxxxx'   // valid
    );
    foreach(
    $passwords as $pwd) {
       
    printf("<p>'%s' is %s</p>\n"$pwd, (isValidPwd($pwd)) ? 'Valid' 'NOT Valid');
    }
    "Well done....Consciousness to sarcasm in five seconds!" ~ Terry Pratchett, Night Watch

    How to Ask Questions the Smart Way (not affiliated with this site, but well worth reading)

    My Blog
    cwrBlog: simple, no-database PHP blogging framework

  7. #7
    Join Date
    Nov 2010
    Posts
    62
    Hi there. Thanks it worked like a treat.

    Sorry to be a hasstle but you don't suppose you could do it for JS as well?

    here's my current code (I used from else where)
    Code:
    		var pass1 = $("input#password").val();
    		var passregex = /(?=^.{8,}$)((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$/i;
    		if (pass1.search(passregex) == -1) {
    		  $("label#password_error").show(); 
    		  $("input#password").focus();
    		  return false;
    		}
    Thanks a lot. Regex stuff is just far too confusing!
    Cheers

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
HTML5 Development Center

"

"

X vBulletin 4.2.2 Debug Information

  • Page Generation 0.16676 seconds
  • Memory Usage 2,914KB
  • Queries Executed 15 (?)
More Information
Template Usage (35):
  • (1)SHOWTHREAD
  • (1)ad_footer_end
  • (1)ad_footer_start
  • (1)ad_global_above_footer
  • (1)ad_global_below_navbar
  • (1)ad_global_header1
  • (1)ad_global_header2
  • (1)ad_navbar_below
  • (1)ad_showthread_firstpost_sig
  • (1)ad_showthread_firstpost_start
  • (1)ad_thread_first_post_content
  • (1)ad_thread_last_post_content
  • (1)bbcode_code
  • (3)bbcode_php
  • (1)bbcode_quote
  • (1)footer
  • (1)forumjump
  • (1)forumrules
  • (1)gobutton
  • (1)header
  • (1)headinclude
  • (1)headinclude_bottom
  • (7)memberaction_dropdown
  • (1)navbar
  • (4)navbar_link
  • (1)navbar_moderation
  • (1)navbar_noticebit
  • (1)navbar_tabs
  • (2)option
  • (7)postbit
  • (7)postbit_onlinestatus
  • (7)postbit_wrapper
  • (1)spacer_close
  • (1)spacer_open
  • (1)tagbit_wrapper 

Phrase Groups Available (6):
  • global
  • inlinemod
  • postbit
  • posting
  • reputationlevel
  • showthread
Included Files (26):
  • ./showthread.php
  • ./global.php
  • ./includes/class_bootstrap.php
  • ./includes/init.php
  • ./includes/class_core.php
  • ./includes/config.php
  • ./includes/functions.php
  • ./includes/functions_navigation.php
  • ./includes/class_friendly_url.php
  • ./includes/class_hook.php
  • ./includes/class_bootstrap_framework.php
  • ./vb/vb.php
  • ./vb/phrase.php
  • ./includes/functions_facebook.php
  • ./includes/functions_calendar.php
  • ./includes/functions_bigthree.php
  • ./includes/class_postbit.php
  • ./includes/class_bbcode.php
  • ./includes/functions_reputation.php
  • ./includes/functions_notice.php
  • ./packages/vbattach/attach.php
  • ./vb/types.php
  • ./vb/cache.php
  • ./vb/cache/db.php
  • ./vb/cache/observer/db.php
  • ./vb/cache/observer.php 

Hooks Called (70):
  • init_startup
  • friendlyurl_resolve_class
  • init_startup_session_setup_start
  • database_pre_fetch_array
  • database_post_fetch_array
  • init_startup_session_setup_complete
  • global_bootstrap_init_start
  • global_bootstrap_init_complete
  • cache_permissions
  • fetch_threadinfo_query
  • fetch_threadinfo
  • fetch_foruminfo
  • load_show_variables
  • load_forum_show_variables
  • global_state_check
  • global_bootstrap_complete
  • global_start
  • style_fetch
  • global_setup_complete
  • showthread_start
  • showthread_getinfo
  • strip_bbcode
  • friendlyurl_clean_fragment
  • friendlyurl_geturl
  • forumjump
  • cache_templates
  • cache_templates_process
  • template_register_var
  • template_render_output
  • fetch_template_start
  • fetch_template_complete
  • parse_templates
  • fetch_musername
  • notices_check_start
  • notices_noticebit
  • process_templates_complete
  • friendlyurl_redirect_canonical
  • showthread_post_start
  • showthread_query_postids
  • showthread_query
  • bbcode_fetch_tags
  • bbcode_create
  • showthread_postbit_create
  • postbit_factory
  • postbit_display_start
  • postbit_imicons
  • bbcode_parse_start
  • bbcode_parse_complete_precache
  • bbcode_parse_complete
  • postbit_display_complete
  • memberaction_dropdown
  • tag_fetchbit_complete
  • forumrules
  • navbits
  • navbits_complete
  • build_navigation_data
  • build_navigation_array
  • check_navigation_permission
  • process_navigation_links_start
  • process_navigation_links_complete
  • set_navigation_menu_element
  • build_navigation_menudata
  • build_navigation_listdata
  • build_navigation_list
  • set_navigation_tab_main
  • set_navigation_tab_fallback
  • navigation_tab_complete
  • fb_like_button
  • showthread_complete
  • page_templates