Limit length of characters in a regular expression

Question

Is there a way to limit a regular expression to 100 characters WITH a regular expression     size                 size    So Look at me  wouldn t work   I want to limit the numbers  only allow numbers between 1 and 100

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d 2      d 4      d 5       This expression takes the number of length 2 4 and 5  Valid Inputs are  12 1234 12345

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If you want numbers from 1 up to 100   100  1-9  d

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Limit the length of characters in a regular expression    a-z  6 15      Limit length of characters or Numbers in a regular expression    a-z   0-9  6 15

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If you want to restrict valid input to integer values between 1 and 100  this will do it      1-9   1-9  0-9  100       Explanation        start of input      multiple options to match First argument  1-9  - matches any entries between 1 and 9     OR argument separator Second Argument  1-9  0-9  - matches entries between 10 and 99 Last Argument 100 - Self explanatory - matches entries of 100   This WILL NOT ACCEPT   1  Zero - 0  2  Any integer preceded with a zero - 01  021  001  3  Any integer greater than 100  Hope this helps   Gez

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Is there a way to limit a regex to 100 characters WITH regex    Your example suggests that you d like to grab a number from inside the regex and then use this number to place a maximum length on another part that is matched later in the regex  This usually isn t possible in a single pass  Your best bet is to have two separate regular expressions    one to match the maximum length you d like to use one which uses the previously extracted value to verify that its own match does not exceed the specified length   If you just want to limit the number of characters matched by an expression  most regular expressions support bounds by using braces  For instance    d 3 - d 3 - d 4    will match  US  phone numbers  exactly three digits  then a hyphen  then exactly three digits  then another hyphen  then exactly four digits   Likewise  you can set upper or lower limits    d 5 10    means  at least 5  but not more than 10 digits      Update  The OP clarified that he s trying to limit the value  not the length  My new answer is don t use regular expressions for that  Extract the value  then compare it against the maximum you extracted from the size parameter  It s much less error-prone

[regex] Limit length of characters in a regular expression?

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