RegEx verification help

i'm trying to make a validation page and i am having issues with some of them

AGE - i'm not sure where to go from here

var age = /^[0-9 ]{3,20}$/;   // trying to check age (only 18-25 is valid)

Code (markup):

Name - how do i make it so that no spaces are allowed?

/^[A-Za-z ]{3,50}$/

Code (markup):

street - i have no clue where to even begin on this. i think that RegEx can't be used to validate all addresses, but something simple like 123 main street. maybe something like this

preg_match('/.{2,60}$/',$address)

Code (markup):

here's an example of my zip code one to give you an idea of what im going for

function checkZip(){
var re5digit=/^\d{5}$/ //regular expression defining a 5 digit number
if (document.myform.zip.value.search(re5digit)==-1) //if match failed
alert("Please enter a valid 5 digit number inside form")
}

Code (markup):

HTML FORM

<form name="myform" onsubmit="return checkZip()">
		<fieldset>
		<legend>Test Form</legend>			

		Firstname*: <input type="text" name="firstname"/><br/>
		Lastname*: <input type="text" name="lastname"/><br/>
		Street*: <input type="text" name="street"/><br/>
		City*: <input type="text" name="city"/><br/>
		State*: <input type="text" name="state"/><br/>
		Zip*: <input type="text" name="zip"/><br/>
		Age*: <input type="text" name="age"/><br/>
		Gender*: <input type="text" name="gender"/><br/>
		Major/Program Choice*: <input type="text" name="major"/><br/><br/>
		<input type="reset" /> 
		<input type="submit" /> 

Code (markup):

what is a good way to combine these into all one function using getElementByID? i could make another function and put all the other functions in it, but i'm not sure where i can incorporate getElementByID

when the verification is complete, i want to display all the info using getElementByID and innerHTML. should i make vars that hold all the info and put in after a span somewhere?

 

Age - Numbers between 18 and 25:

^1[89]|2[0-5]$

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Name - What do you mean by no spaces are allowed? I'm confused... Anyway, the regex for letters only string, and starts with caps:

^[A-Z][a-z]+$

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This one can also match names like "McDonald", "O'Neal" or so:

^[A-Z]'?[A-Za-z]+$

Code (markup):

Street - I have no idea because there are no standard formats in street names. Maybe this one is a better choice, just to ensure the field is not left blank:

^.+$

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or according to your requirement, number followed with letters:

^\d+\w+$

Code (markup):

Zipcode - you've solved this

^\d{5}$

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You may need to give a unique ID to each field you want to validate
For example the age:

var age=document.getElementById('age');
var ageRegex=/^1[89]|2[0-5]$/;
if (!age.match(ageRegex)) {
    //invalid message, blah blah blah...
}

Code (markup):