regular expression to match exactly 5 digits

Question

testing  testing match    d 5   g     I m reading a full html into variable  From the variable  want to grab out all numbers with the pattern of exactly 5 digits  No need to care of whether before after this digit having other type of words  Just want to make sure whatever that is 5 digit numbers been grabbed out   However  when I apply it  it not only pull out number with exactly 5 digit  number with more than 5 digits also retrieved     I had tried putting   in front and   behind  but it making result come out as null

User · Answer

No need to care of whether before after this digit having other type of words   To just match the pattern of 5 digits number anywhere in the string  no matter it is separated by space or not  use this regular expression    lt   d  d 5     d    Sample JavaScript codes    var regexp   new RegExp     lt   d  d 5     d  g        var matches   yourstring match regexp       if  matches  amp  amp  matches length  gt  0            for  var i   0  len   matches length  i  lt  len  i                         ydo something with matches i                         Here s some quick results    abc12345xyz     12345abcd     abcd12345     0000aaaa2       a1234a5     12345      lt space gt 12345 lt space gt 12345

User · Answer

I am reading a text file and want to use regex below to pull out numbers with exactly 5 digit  ignoring alphabets   Try this    var str    f 34 545 323 12345 54321 123456       matches   str match   b d 5  b g    console log matches        quot 12345 quot    quot 54321 quot    jsFiddle  The word boundary  b is your friend here  Update My regex will get a number like this 12345  but not like a12345  The other answers provide great regexes if you require the latter

User · Answer

what is about this   D  d 5   D  This will do on   f 23 23453 234 2344 2534 hallo33333  50000   23453  33333 50000

User · Answer

My test string for the following   testing  12345 abc 123 54321 ab15234 123456 52341     If I understand your question  you d want   12345    54321    15234    52341     If JS engines supported regexp lookbehinds  you could do   testing match     lt   d  d 5     d  g    Since it doesn t currently  you could   testing match        D   d 5      d  g    and remove the leading non-digit from appropriate results  or   pentadigit        D   d 5      d  g  result       while    match   pentadigit exec testing           result push match 1        Note that for IE  it seems you need to use a RegExp stored in a variable rather than a literal regexp in the while loop  otherwise you ll get an infinite loop

User · Answer

This should work    lt script type  text javascript  gt  var testing  this is d23553 test 32533 n31203 not 333   var r   new RegExp          d    d 5          d   mg   var matches       while   match   r exec testing    matches push match 1    alert  Found    matches join          lt  script gt

[javascript] regular expression to match exactly 5 digits

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