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{{JavaScript Syntax}}The following technique can be used to prevent a user from entering special characters in designated form fields[[Custom Fields]].<br>

Include the following code in the '''HTML Tag box ''' of the [[Custom Fields|custom field]] you wish to restrict:

onchange="javascript:this.value=this.value.replace(/['''''Search Expression''''']/'''flag''',' '''New String''' ');"

* \W = Matches any character that is '''not ''' a word character from the basic Latin alphabet, an integer, or the underscore. Equivalent to [^A-Z a-z 0-9 _]

* \D = Matches any character that is '''not''' = single quotes* \" = double quotesan integer.* \d = Matches a digit character in the basic Latin alphabetall integers. Equivalent to [0-9]

* [xyz]= A character set. Matches any one of the enclosed characters. You can specify a range of characters by using a hyphen. For example, [abcd] is the same as [a-d]. They match the 'b' in "brisket" and the 'c' in "ache".:* Any individual character can be specified within the square brackets except double quote " which has special meaning.:* If you wish to include the backslash \ or closing square bracket ] you must precede them with a backslash (the first backslash tells the system to read the next character but not interpret it. See Example 2 below).  For Flags Flag the following options are available:* g = global match

'''1. To remove all characters that aren't part of the basic Latin alphabet and 0-9 (such as . , & ; : ~ ! @ # $ % ^ & * ( ) + " ' <u>including the space key</u>) and immediately replace them with an underscore (_):  onkeyup="this.value=this.value.replace(/[\W]/g,' characters _');"  2. The following code will look for # [ $ ] and \ and replace them with an underscore (_) actively while typing once the user has clicked away from the textfield:  onchange="this. value=this.value.replace(/[#[$\]\\@]/g,'_');" '''Note''': if you also want to replace double quotes you must omit the double quotes around the javascript statement::''onchange=javascript:this.value=this.value.replace(/['@#&"]/g,'_');''If you want to replace double quotes with a single quote use this::''<prenowiki>onkeyup="javascript:this.value=this.value.replace(/[\W"]/g,'_\'');"</prenowiki>'' 

:'''2. After user has entered text and clicked away from the field, the following code will look for " and ' quotes and replace them with an underscore (_).<prenowiki>onchangeonkeyup="javascript:this.value=this.value.replace(/['\''&'\"'D]/g,'_');"</prenowiki>''

'''3. To restrict user to only enter Integer numbers write this code in the HTML tag box.<pre>onkeyup="javascript:this.value=this.value.replace(/See Also==* [[^\dSsescape|ssEscape]]/g,'');"</pre>

[[Category:Custom Fields]][[Category:JavaScript Examples]]