Unexpected behaviour of regex validating email
我正在使用以下regex验证电子邮件地址
1 | var regex=/^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/; |
现在的问题是它表现出了意想不到的行为
如果我输入电子邮件地址
1 | pakistan@gmail.com |
号
上面的regex接受它作为电子邮件地址的验证格式。但是当我使用格式
1 | igz.dwd.08@gmail.com |
regex不将其验证为电子邮件格式
同样地
1 | abcdef@gmail.com |
不是验证格式，
1 | awaisobaidzaid@gmail.com |
是验证电子邮件格式我特别想要格式的电子邮件地址的有效性
1 | igz.dwd.08@gmail.com |
我在上面犯了什么错误？
由RFC822定义的电子邮件地址(被RFC2822取代)是一个非常复杂的regex。在最初的RFC中，它被定义为递归下降。这使得用正则表达式表达它非常困难。请参阅本"文章"：http://www.ex-parrot.com/pdw/mail-rfc822-address.html
在Perl样式的regex中：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 | (?:(?: )?[ \t])*(?:(?:(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t] )+|\Z|(?=[\["()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:( ?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*))*@(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\0 31]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\ ](?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+ (?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?: (?: )?[ \t])*))*|(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z |(?=[\["()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: ) ?[ \t])*)*\<(?:(?: )?[ \t])*(?:@(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?:\ r )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: ) ?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t] )*))*(?:,@(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])* )(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t] )+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*))*) *:(?:(?: )?[ \t])*)?(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+ |\Z|(?=[\["()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t ]))*"(?:(?: )?[ \t])*))*@(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031 ]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\]( ?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(? :(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(? : )?[ \t])*))*\>(?:(?: )?[ \t])*)|(?:[^()<>@,;:\".\[\] \000-\031]+(?:(? :(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )? [ \t]))*"(?:(?: )?[ \t])*)*:(?:(?: )?[ \t])*(?:(?:(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|"(?:[^" \\]| \\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<> @,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|" (?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*))*@(?:(?: )?[ \t] )*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\\ ".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(? :[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[ \]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*))*|(?:[^()<>@,;:\".\[\] \000- \031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|( ?:(?: )?[ \t]))*"(?:(?: )?[ \t])*)*\<(?:(?: )?[ \t])*(?:@(?:[^()<>@,; :\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([ ^\[\] \\]|\\.)*\](?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\" .\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\ ] \\]|\\.)*\](?:(?: )?[ \t])*))*(?:,@(?:(?: )?[ \t])*(?:[^()<>@,;:\".\ [\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\]\ r\\]|\\.)*\](?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\] |\\.)*\](?:(?: )?[ \t])*))*)*:(?:(?: )?[ \t])*)?(?:[^()<>@,;:\".\[\] \0 00-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|"(?:[^" \\]|\\ .|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@, ;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\]]))|"(? :[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*))*@(?:(?: )?[ \t])* (?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\". \[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[ ^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\] ]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*))*\>(?:(?: )?[ \t])*)(?:,\s*( ?:(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\\ ".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*)(?:\.(?:( ?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[ \["()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t ])*))*@(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t ])+|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*)(? :\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+| \Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*))*|(?: [^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\".\[\ ]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*)*\<(?:(?: ) ?[ \t])*(?:@(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\[" ()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*)(?:\.(?:(?: ) ?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<> @,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*))*(?:,@(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@, ;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t] )*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\\ ".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*))*)*:(?:(?: )?[ \t])*)? (?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\["()<>@,;:\". \[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t])*)(?:\.(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z|(?=[\[ "()<>@,;:\".\[\]]))|"(?:[^" \\]|\\.|(?:(?: )?[ \t]))*"(?:(?: )?[ \t]) *))*@(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t]) +|\Z|(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*)(?:\ .(?:(?: )?[ \t])*(?:[^()<>@,;:\".\[\] \000-\031]+(?:(?:(?: )?[ \t])+|\Z |(?=[\["()<>@,;:\".\[\]]))|\[([^\[\] \\]|\\.)*\](?:(?: )?[ \t])*))*\>(?:( ?: )?[ \t])*))*)?;\s*) |
号
如果您真的想使用javascript+regex进行验证，请尝试这个非常长的验证。我已经用了一段时间了，到目前为止还没有问题。
1 | var regex = /^(?:"(?:[^\"]|\\.)+"|[A-Za-z0-9!#$%&'\*\+\-\/=\?^_`{|}~]+(?:\.[A-Za-z0-9!#$%&'\*\+\-\/=\?^_`{|}~]+)*)@(?:[A-Za-z](?:[A-Za-z0-9\-]{0,61}[A-Za-z0-9])?(?:\.[A-Za-z](?:[A-Za-z0-9\-]{0,61}[A-Za-z0-9])?)*|\[(?:(?:2(?:[0-4]\d|5[0-5])|[0-1]?\d{1,2})(?:\.(?:2(?:[0-4]\d|5[0-5])|[0-1]?\d{1,2})){3}|(?:(?:(?:[0-9A-Fa-f]{1,4}\:){1,1}(?:\:[0-9A-Fa-f]{1,4}){1,6})|(?:(?:[0-9A-Fa-f]{1,4}\:){1,2}(?:\:[0-9A-Fa-f]{1,4}){1,5})|(?:(?:[0-9A-Fa-f]{1,4}\:){1,3}(?:\:[0-9A-Fa-f]{1,4}){1,4})|(?:(?:[0-9A-Fa-f]{1,4}\:){1,4}(?:\:[0-9A-Fa-f]{1,4}){1,3})|(?:(?:[0-9A-Fa-f]{1,4}\:){1,5}(?:\:[0-9A-Fa-f]{1,4}){1,2})|(?:(?:[0-9A-Fa-f]{1,4}\:){1,6}(?:\:[0-9A-Fa-f]{1,4}){1,1})|(?:[0-9A-Fa-f]{1,4}(?:\:[0-9A-Fa-f]{1,4}){7})|(?:(?:(?:[0-9A-Fa-f]{1,4}\:){1,7}|\:)\:)|(?:\:(?:\:[0-9A-Fa-f]{1,4}){1,7})|(?:(?:(?:(?:[0-9A-Fa-f]{1,4}\:){6})(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}))|(?:(?:(?:[0-9A-Fa-f]{1,4}\:){5}[0-9A-Fa-f]{1,4}\:(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}))|(?:(?:[0-9A-Fa-f]{1,4}\:){5}\:[0-9A-Fa-f]{1,4}\:(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3})|(?:(?:[0-9A-Fa-f]{1,4}\:){1,1}(?:\:[0-9A-Fa-f]{1,4}){1,4}\:(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3})|(?:(?:[0-9A-Fa-f]{1,4}\:){1,2}(?:\:[0-9A-Fa-f]{1,4}){1,3}\:(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3})|(?:(?:[0-9A-Fa-f]{1,4}\:){1,3}(?:\:[0-9A-Fa-f]{1,4}){1,2}\:(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3})|(?:(?:[0-9A-Fa-f]{1,4}\:){1,4}(?:\:[0-9A-Fa-f]{1,4}){1,1}\:(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3})|(?:(?:(?:[0-9A-Fa-f]{1,4}\:){1,5}|\:)\:(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3})|(?:\:(?:\:[0-9A-Fa-f]{1,4}){1,5}\:(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}))(?:\%\d+)?)\])$/; |
P.S.它符合RFC822和RFC5322，除了不能在单个纯regex中完成的长度验证。
首先，不要转义字符类中的字符，即
其次，短划线字符必须是字符类中的第一个或最后一个字符，否则它是范围运算符。
尝试此操作：编辑后包含@benroux的w建议
1 | var regex=/^([\w.-])+\@([\w.-])+\.([A-Za-z]{2,4})$/ |
P.S.我测试过，这个regex与
对于初学者来说，
埃多克斯1〔5〕
我在你所有的邮件上都试过了，而且效果很好
试试这个
1 | /^[\w.-]+@[\w.-]+\.[a-zA-Z]{2,4}$/ |
。