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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>

1. Include the following code in the '''HTML Tag box ''' of the [[Custom Fields|custom field]] you wish to restrict::''onChange onchange="javascript:this.value=this.value.replace(/['''''character setSearch Expression''''']/g'''flag''',' '''New String'''');" where *'''Search Expression''' specifies a string value to find.*'''New String''' specifies the replacement characterstring.*'''flag '' ')is a command line switch used to control outcome of the replace operation.

where ==Options==For Search Expression you can use* \W = Matches any character that is '''not''' a character from the basic Latin alphabet, an integer, or the underscore.* \w = Matches any alphanumeric character from the basic Latin alphabet, including the underscore. Equivalent to [A-Za-z0-9_]* \D = Matches any character that is '''not'''an integer.* \d = Matches all integers. Equivalent to [0-9]* \0 = NULL character* \s = Matches a single white space character* [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' defines in "ache". :* Any individual character can be specified within the square brackets except double quote " which characters has special meaning.:* If you wish to include the backslash \ or closing square bracket ] you want must precede them with a backslash (the first backslash tells the system to remove, and read the next character but not interpret it. See Example 2 below).  For Flag the following options are available:* g = global match * i = ignore case   Using ''onChange''will replace characterthe characters as soon as the user clicks away from current field, or hits Save.<br>Using ''onKeyup'' defines what you want will replace the special characters replaced withas soon as they are typed.

1. To remove all characters that aren't part of the basic Latin alphabet and 0-9 (such as . , & ; : ~ ! @ # $ % ^ & * ( ) + " ' <u>including the space key<pre/u>function valid) and immediately replace them with an underscore (o_) :{ var re onkeyup=/[&'"]/g othis.value = othis.value.replace(re/[\W]/g,'_');"}</pre>2. The example above following code will remove all & " look for # [ $ ] and ' characters \ and replace them with an underscore (_). If you would rather simple remove once the characters you should use the following as the last line of user has clicked away from the functionfield: o.value = o.value.replace(re,'');

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