$re = '%[!-,.-/:-@[-`{-~]%';
$str = '! " # $ % & \' ( ) * + , - . / : ; < = > ? @ [ \\ ] ^ _ \\ { | } ~
32 040 20 00100000   Space
33 041 21 00100001 ! ! Exclamation mark
34 042 22 00100010 " " " Double quotes (or speech marks)
35 043 23 00100011 # # Number
36 044 24 00100100 $ $ Dollar
37 045 25 00100101 % % Procenttecken
38 046 26 00100110 & & & Ampersand
39 047 27 00100111 \' ' Single quote
40 050 28 00101000 ( ( Open parenthesis (or open bracket)
41 051 29 00101001 ) ) Close parenthesis (or close bracket)
42 052 2A 00101010 * * Asterisk
43 053 2B 00101011 + + Plus
44 054 2C 00101100 , , Comma
45 055 2D 00101101 - - Hyphen
46 056 2E 00101110 . . Period, dot or full stop
47 057 2F 00101111 / / Slash or divide
48 060 30 00110000 0 0 Zero
49 061 31 00110001 1 1 One
50 062 32 00110010 2 2 Two
51 063 33 00110011 3 3 Three
52 064 34 00110100 4 4 Four
53 065 35 00110101 5 5 Five
54 066 36 00110110 6 6 Six
55 067 37 00110111 7 7 Seven
56 070 38 00111000 8 8 Eight
57 071 39 00111001 9 9 Nine
58 072 3A 00111010 : : Colon
59 073 3B 00111011 ; ; Semicolon
60 074 3C 00111100 < < < Less than (or open angled bracket)
61 075 3D 00111101 = = Equals
62 076 3E 00111110 > > > Greater than (or close angled bracket)
63 077 3F 00111111 ? ? Question mark
64 100 40 01000000 @ @ At symbol
65 101 41 01000001 A A Uppercase A
66 102 42 01000010 B B Uppercase B
67 103 43 01000011 C C Uppercase C
68 104 44 01000100 D D Uppercase D
69 105 45 01000101 E E Uppercase E
70 106 46 01000110 F F Uppercase F
71 107 47 01000111 G G Uppercase G
72 110 48 01001000 H H Uppercase H
73 111 49 01001001 I I Uppercase I
74 112 4A 01001010 J J Uppercase J
75 113 4B 01001011 K K Uppercase K
76 114 4C 01001100 L L Uppercase L
77 115 4D 01001101 M M Uppercase M
78 116 4E 01001110 N N Uppercase N
79 117 4F 01001111 O O Uppercase O
80 120 50 01010000 P P Uppercase P
81 121 51 01010001 Q Q Uppercase Q
82 122 52 01010010 R R Uppercase R
83 123 53 01010011 S S Uppercase S
84 124 54 01010100 T T Uppercase T
85 125 55 01010101 U U Uppercase U
86 126 56 01010110 V V Uppercase V
87 127 57 01010111 W W Uppercase W
88 130 58 01011000 X X Uppercase X
89 131 59 01011001 Y Y Uppercase Y
90 132 5A 01011010 Z Z Uppercase Z
91 133 5B 01011011 [ [ Opening bracket
92 134 5C 01011100 \\ \ Backslash
93 135 5D 01011101 ] ] Closing bracket
94 136 5E 01011110 ^ ^ Caret - circumflex
95 137 5F 01011111 _ _ Underscore
96 140 60 01100000 ` ` Grave accent
97 141 61 01100001 a a Lowercase a
98 142 62 01100010 b b Lowercase b
99 143 63 01100011 c c Lowercase c
100 144 64 01100100 d d Lowercase d
101 145 65 01100101 e e Lowercase e
102 146 66 01100110 f f Lowercase f
103 147 67 01100111 g g Lowercase g
104 150 68 01101000 h h Lowercase h
105 151 69 01101001 i i Lowercase i
106 152 6A 01101010 j j Lowercase j
107 153 6B 01101011 k k Lowercase k
108 154 6C 01101100 l l Lowercase l
109 155 6D 01101101 m m Lowercase m
110 156 6E 01101110 n n Lowercase n
111 157 6F 01101111 o o Lowercase o
112 160 70 01110000 p p Lowercase p
113 161 71 01110001 q q Lowercase q
114 162 72 01110010 r r Lowercase r
115 163 73 01110011 s s Lowercase s
116 164 74 01110100 t t Lowercase t
117 165 75 01110101 u u Lowercase u
118 166 76 01110110 v v Lowercase v
119 167 77 01110111 w w Lowercase w
120 170 78 01111000 x x Lowercase x
121 171 79 01111001 y y Lowercase y
122 172 7A 01111010 z z Lowercase z
123 173 7B 01111011 { { Opening brace
124 174 7C 01111100 | | Vertical bar
125 175 7D 01111101 } } Closing brace
126 176 7E 01111110 ~ ~ Equivalency sign - tilde
127 177 7F 01111111  Delete';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php