Regular expression for validating a number quad dating

If there are no empty fields, then the following code validates the first name by calling the static method Match of the Regex class, passing both the string to validate and the Regular Expression as arguments. This object contains a Success property that indicates whether a method Match's first argument matches the pattern specified by the Regular Expression in the second argument.

If the value of Success is false (i.e., there was no match), then it displays an error message and sets the focus back to the first Name Text Box so that the user can retype the input and terminate the event handler.

An exception is when the number happens to already be a string, such as when getting user input from the console.

(To ensure the string is a number to begin with, you could use \b(0|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|388|389|390|391|392|393|394|395|396|397|398|399|400)\b ( //Capture group for the entire number -? Enter a number between -20: -300 Number: -300 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As so many answers - correctly - pointed out that using regex is horrible for this scenario, lets think about other ways in OCaml!

The number is issued to an individual by the Social Security Administration and primary purpose is to track individuals for the U. Social Security program, which can allocate benefits and is commonly referred to as a unique identifier for individuals within the United States for a variety of federal purposes. The number itself can be broken into three major components and appears in the following format (with or without dashes) : You may notice a great deal of past-tense within the previous descriptions.

The United States is not the only country to use Social Security Numbers, but for demonstration purposes we will focus on validating U. This is because on June 25th, 2011, the Social Security Administration revised their assignment process to use a system of randomization that had the following changes : The previously mentioned "randomization act" made it significantly easier to use a mechanism such as a Regular Expression to handle validating Social Security Numbers.

This means that the regex will match 999 but not 0999. :5[0-5] //50 through 55 | //or [0-4][0-9]) //00 through 49 | //or 1[0-9] //a one followed by any three digits | //or [1-9][0-9] //1-9 followed by 0 through 2 of any digit | //or (? It's an interesting exercise, because you can think of two distinct method: roughly, you can either: Without trying, how would you know which is best? (With thanks to Plasma Power and Casimir et Hippolyte for the debugging assistance.) Depending on what you are capturing, it is likely that all sub-groups should be made into non-capture groups. It turns out that the first approach (aliteralmind's answer) is far more economical. Speed Tests Here is the output of my simple speed test, matching from -1M to 1M. If you would like leading zeroes, let me know, that is a very easy tweak. x) # free-spacing mode ^ # anchor at beginning of string. This blog post focuses on validating the last of those : Social Security Numbers and why they may be a bit deceivingly more difficult to validate than you might expect.

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