I’d like to describe ASCII character code. Please refer to this article when you configure string pattern of regular expression. The code number 8, 9, 10 and 13 are control character, which are used as back space, tab, line feed and carriage return, respectively.
Character class of alphanumeric character is expressed as [a-zA-Z0-9] in regular expression, single-byte symbol class is expressed as [!-/:-@[-`{-~]. In character class, ] and \ character need to escape.
| Code | Character | Meta character |
| 0 | ||
| 1 | ||
| 2 | ||
| 3 | ||
| 4 | ||
| 5 | ||
| 6 | ||
| 7 | ||
| 8 | *1 | |
| 9 | *2 | |
| 10 | *3 | |
| 11 | ||
| 12 | ||
| 13 | *4 | |
| 14 | ||
| 15 | ||
| 16 | ||
| 17 | ||
| 18 | ||
| 19 | ||
| 20 | ||
| 21 | ||
| 22 | ||
| 23 | ||
| 24 | ||
| 25 | ||
| 26 | ||
| 27 | ||
| 28 | ||
| 29 | ||
| 30 |
–
|
|
| 31 | ||
| 32 | [space] | |
| 33 | ! | |
| 34 | ” | |
| 35 | # | |
| 36 | $ | |
| 37 | % | |
| 38 | & | |
| 39 | ‘ | |
| 40 | ( | ✔ |
| 41 | ) | ✔ |
| 42 | * | ✔ |
| 43 | + | ✔ |
| 44 | , | |
| 45 | – | |
| 46 | . | ✔ |
| 47 | / | |
| 48 | 0 | |
| 49 | 1 | |
| 50 | 2 | |
| 51 | 3 | |
| 52 | 4 | |
| 53 | 5 | |
| 54 | 6 | |
| 55 | 7 | |
| 56 | 8 | |
| 57 | 9 | |
| 58 | : | |
| 59 | ; | |
| 60 | < | |
| 61 | = | |
| 62 | > | |
| 63 | ? | ✔ |
| 64 | @ | |
| 65 | A | |
| 66 | B | |
| 67 | C | |
| 68 | D | |
| 69 | E | |
| 70 | F | |
| 71 | G | |
| 72 | H | |
| 73 | I | |
| 74 | J | |
| 75 | K | |
| 76 | L | |
| 77 | M | |
| 78 | N | |
| 79 | O | |
| 80 | P | |
| 81 | Q | |
| 82 | R | |
| 83 | S | |
| 84 | T | |
| 85 | U | |
| 86 | V | |
| 87 | W | |
| 88 | X | |
| 89 | Y | |
| 90 | Z | |
| 91 | [ | ✔ |
| 92 | \ | ✔ |
| 93 | ] | ✔ |
| 94 | ^ | ✔ |
| 95 | _ | |
| 96 | ` | |
| 97 | a | |
| 98 | b | |
| 99 | c | |
| 100 | d | |
| 101 | e | |
| 102 | f | |
| 103 | g | |
| 104 | h | |
| 105 | i | |
| 106 | j | |
| 107 | k | |
| 108 | l | |
| 109 | m | |
| 110 | n | |
| 111 | o | |
| 112 | p | |
| 113 | q | |
| 114 | r | |
| 115 | s | |
| 116 | t | |
| 117 | u | |
| 118 | v | |
| 119 | w | |
| 120 | x | |
| 121 | y | |
| 122 | z | |
| 123 | { | ✔ |
| 124 | | | ✔ |
| 125 | } | ✔ |
| 126 | ~ | |
| 127 |
Reference:
ASCII (Wikipedia)
