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   4 <title>Character Classes that are Always Supported</title>
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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="boost_regex.syntax.character_classes.std_char_classes"></a><a class="link" href="std_char_classes.html" title="Character Classes that are Always Supported">Character
  28         Classes that are Always Supported</a>
  29 </h4></div></div></div>
  30 <p>
  31           The following character class names are always supported by Boost.Regex:
  32         </p>
  33 <div class="informaltable"><table class="table">
  34 <colgroup>
  35 <col>
  36 <col>
  37 <col>
  38 </colgroup>
  39 <thead><tr>
  40 <th>
  41                   <p>
  42                     Name
  43                   </p>
  44                 </th>
  45 <th>
  46                   <p>
  47                     POSIX-standard name
  48                   </p>
  49                 </th>
  50 <th>
  51                   <p>
  52                     Description
  53                   </p>
  54                 </th>
  55 </tr></thead>
  56 <tbody>
  57 <tr>
  58 <td>
  59                   <p>
  60                     alnum
  61                   </p>
  62                 </td>
  63 <td>
  64                   <p>
  65                     Yes
  66                   </p>
  67                 </td>
  68 <td>
  69                   <p>
  70                     Any alpha-numeric character.
  71                   </p>
  72                 </td>
  73 </tr>
  74 <tr>
  75 <td>
  76                   <p>
  77                     alpha
  78                   </p>
  79                 </td>
  80 <td>
  81                   <p>
  82                     Yes
  83                   </p>
  84                 </td>
  85 <td>
  86                   <p>
  87                     Any alphabetic character.
  88                   </p>
  89                 </td>
  90 </tr>
  91 <tr>
  92 <td>
  93                   <p>
  94                     blank
  95                   </p>
  96                 </td>
  97 <td>
  98                   <p>
  99                     Yes
 100                   </p>
 101                 </td>
 102 <td>
 103                   <p>
 104                     Any whitespace character that is not a line separator.
 105                   </p>
 106                 </td>
 107 </tr>
 108 <tr>
 109 <td>
 110                   <p>
 111                     cntrl
 112                   </p>
 113                 </td>
 114 <td>
 115                   <p>
 116                     Yes
 117                   </p>
 118                 </td>
 119 <td>
 120                   <p>
 121                     Any control character.
 122                   </p>
 123                 </td>
 124 </tr>
 125 <tr>
 126 <td>
 127                   <p>
 128                     d
 129                   </p>
 130                 </td>
 131 <td>
 132                   <p>
 133                     No
 134                   </p>
 135                 </td>
 136 <td>
 137                   <p>
 138                     Any decimal digit
 139                   </p>
 140                 </td>
 141 </tr>
 142 <tr>
 143 <td>
 144                   <p>
 145                     digit
 146                   </p>
 147                 </td>
 148 <td>
 149                   <p>
 150                     Yes
 151                   </p>
 152                 </td>
 153 <td>
 154                   <p>
 155                     Any decimal digit.
 156                   </p>
 157                 </td>
 158 </tr>
 159 <tr>
 160 <td>
 161                   <p>
 162                     graph
 163                   </p>
 164                 </td>
 165 <td>
 166                   <p>
 167                     Yes
 168                   </p>
 169                 </td>
 170 <td>
 171                   <p>
 172                     Any graphical character.
 173                   </p>
 174                 </td>
 175 </tr>
 176 <tr>
 177 <td>
 178                   <p>
 179                     l
 180                   </p>
 181                 </td>
 182 <td>
 183                   <p>
 184                     No
 185                   </p>
 186                 </td>
 187 <td>
 188                   <p>
 189                     Any lower case character.
 190                   </p>
 191                 </td>
 192 </tr>
 193 <tr>
 194 <td>
 195                   <p>
 196                     lower
 197                   </p>
 198                 </td>
 199 <td>
 200                   <p>
 201                     Yes
 202                   </p>
 203                 </td>
 204 <td>
 205                   <p>
 206                     Any lower case character.
 207                   </p>
 208                 </td>
 209 </tr>
 210 <tr>
 211 <td>
 212                   <p>
 213                     print
 214                   </p>
 215                 </td>
 216 <td>
 217                   <p>
 218                     Yes
 219                   </p>
 220                 </td>
 221 <td>
 222                   <p>
 223                     Any printable character.
 224                   </p>
 225                 </td>
 226 </tr>
 227 <tr>
 228 <td>
 229                   <p>
 230                     punct
 231                   </p>
 232                 </td>
 233 <td>
 234                   <p>
 235                     Yes
 236                   </p>
 237                 </td>
 238 <td>
 239                   <p>
 240                     Any punctuation character.
 241                   </p>
 242                 </td>
 243 </tr>
 244 <tr>
 245 <td>
 246                   <p>
 247                     s
 248                   </p>
 249                 </td>
 250 <td>
 251                   <p>
 252                     No
 253                   </p>
 254                 </td>
 255 <td>
 256                   <p>
 257                     Any whitespace character.
 258                   </p>
 259                 </td>
 260 </tr>
 261 <tr>
 262 <td>
 263                   <p>
 264                     space
 265                   </p>
 266                 </td>
 267 <td>
 268                   <p>
 269                     Yes
 270                   </p>
 271                 </td>
 272 <td>
 273                   <p>
 274                     Any whitespace character.
 275                   </p>
 276                 </td>
 277 </tr>
 278 <tr>
 279 <td>
 280                   <p>
 281                     unicode
 282                   </p>
 283                 </td>
 284 <td>
 285                   <p>
 286                     No
 287                   </p>
 288                 </td>
 289 <td>
 290                   <p>
 291                     Any extended character whose code point is above 255 in value.
 292                   </p>
 293                 </td>
 294 </tr>
 295 <tr>
 296 <td>
 297                   <p>
 298                     u
 299                   </p>
 300                 </td>
 301 <td>
 302                   <p>
 303                     No
 304                   </p>
 305                 </td>
 306 <td>
 307                   <p>
 308                     Any upper case character.
 309                   </p>
 310                 </td>
 311 </tr>
 312 <tr>
 313 <td>
 314                   <p>
 315                     upper
 316                   </p>
 317                 </td>
 318 <td>
 319                   <p>
 320                     Yes
 321                   </p>
 322                 </td>
 323 <td>
 324                   <p>
 325                     Any upper case character.
 326                   </p>
 327                 </td>
 328 </tr>
 329 <tr>
 330 <td>
 331                   <p>
 332                     w
 333                   </p>
 334                 </td>
 335 <td>
 336                   <p>
 337                     No
 338                   </p>
 339                 </td>
 340 <td>
 341                   <p>
 342                     Any word character (alphanumeric characters plus the underscore).
 343                   </p>
 344                 </td>
 345 </tr>
 346 <tr>
 347 <td>
 348                   <p>
 349                     word
 350                   </p>
 351                 </td>
 352 <td>
 353                   <p>
 354                     No
 355                   </p>
 356                 </td>
 357 <td>
 358                   <p>
 359                     Any word character (alphanumeric characters plus the underscore).
 360                   </p>
 361                 </td>
 362 </tr>
 363 <tr>
 364 <td>
 365                   <p>
 366                     xdigit
 367                   </p>
 368                 </td>
 369 <td>
 370                   <p>
 371                     Yes
 372                   </p>
 373                 </td>
 374 <td>
 375                   <p>
 376                     Any hexadecimal digit character.
 377                   </p>
 378                 </td>
 379 </tr>
 380 </tbody>
 381 </table></div>
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 385 <td align="right"><div class="copyright-footer">Copyright &#169; 1998-2013 John Maddock<p>
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