省略符号のregex expression を含みたい。

First Name と Last Name のinput のpattern に大文字もしくは小文字、スペース、ハイフン、apostrophes（省略符号）で構成されているパターンを作りたいのですが、省略符号ができていません。どうしたらできるのでしょうか？

HTML
1<!DOCTYPE html>
2<html>
3	<head>
4		<meta charset="utf-8">
5		<link rel="stylesheet" type="text/css" href="style.css">
6		<title>Toyger Request</title>
7	</head>
8	<body>
9		<p>
10			Please complete the form below to register your interest in purchasing a Toyger.<br>
11			We will be in touch with further details about the cats available.
12		</p>
13		<form method="get" enctype="application/x-www-form-urlencoded" action="http://www.cs.otago.ac.nz/112bin/112formslab.cgi">
14			<fieldset class="textInputs">
15				<legend>Contact Details</legend>
16				<div>
17					<input type="hidden" name="recipient" value="kimto8104@gmail.com">
18					<input type="hidden" name="subject" value="Toyger Request">
19					<input type="hidden" name="followup-page" value="http://www.cs.otago.ac.nz/comp112/followup.html">
20				</div>
21				<ul>
22					<li>
23						<label for="firstname">Firstname:</label>
24						<input type="text" id="firstname" title="Your first name and any middle names" required pattern ="[A-Za-z -']*">
25					</li>
26					<li>
27						<label for="surname">Surname:</label>
28						<input type="text" id="surname" required pattern="[A-Za-z -']*">
29					</li>
30					<li>
31						<label for="sender">Email address:</label>
32						<input type="text" id="sender" name="sender">
33					</li>
34					<li>
35						<label for="phone">Phone number:</label>
36						<input type="tel" id="phone" name="phone" required pattern="[0-9 ()-]+">
37					</li>
38				</ul>
39			</fieldset>
40			<fieldset class="checkRadio">
41				<legend title="choose Email or Phone">Contact Preference</legend>
42				<ul>
43					<li>
44						<label><input type="radio" name="emailRadio" id="emailcontact" value="">Email</label>
45					</li>
46					<li>
47						<label><input type="radio" name="phoneRadio" value="" id="phonecontact">Phone</label>
48					</li>
49				</ul>
50			</fieldset>
51			<fieldset class="checkRadio">
52				<legend>Cat Requirements</legend>
53				<ul>
54					<li>
55						<label><input type="checkbox" name="interestedin" id="kitten" value="kitten">Kitten</label>
56					</li>
57					<li>
58						<label><input type="checkbox" name="interestedin" id="cat" value="cat">Mature</label>
59					</li>
60					<li>
61						<label><input type="checkbox" name="interestedin" id="pet" value="pet">Pet</label>
62					</li>
63					<li>
64						<label><input type="checkbox" name="interestedin" id="show" value="show">Show</label>
65					</li>
66					<li>
67						<label><input type="checkbox" name="interestedin" id="queen" value="queen/stud">Queen</label>
68					</li>
69					<li>
70						<label><input type="checkbox" name="interestedin" id="stud" value="stud">Stud</label>
71					</li>
72				</ul>
73			</fieldset>
74			<fieldset class="textInputs">
75				<legend>Comments</legend>
76				<div>
77					<textarea cols="50" rows="5" id="comments" title="Let us know what you think.">Add your comments here</textarea>
78				</div>
79			</fieldset>
80			<fieldset id = "resubmit">
81				<input type="submit" name="submitButton"  value="Submit">
82				<input type="reset" name="resetButton" value="Reset">
83			</fieldset>
84		</form>
85		
86			<figure>
87				<img src="toyger.jpg" alt="A toyger">
88			</figure>
89		
90		<p>Thank you!</p>
91	</body>
92</html>