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    <p>I am not sure what you were trying to match that wasn't working but here are a few suggestions for your queries.</p> <p>Your first expression,</p> <pre><code>string regexForTypicalInj = @"/\w*((\%27)|(\'))((\%6F)|o|(\%4F))((\%72)|r|(\%52))/ix"; </code></pre> <p>seems to be intended to catch a single quote followed by "or". I would make sure to handle the case when there is space after the single quote and before the "or". Also, you shouldn't need to escape the % or ' characters. With those changes it becomes,</p> <pre><code>string regexForTypicalInj = @"/\w*((%27)|')\s*(o|(%6F)|(%4F))(r|(%72)|(%52))/ix"; </code></pre> <p>The rest of the expressions, I would add the space allowance and also include the url-encoded characters as well. Doing that they become,</p> <pre><code>string regexForUnion = @"/((%27)|')\s*(u|%75|%55)(n|%6E|%4E)(i|%69|%49)(o|%6F|%4F)(n|%6E|%4E)/ix"; string regexForSelect = @"/((%27)|')\s*(s|%73|%53)(e|%65|%45)(l|%6C|%4C)(e|%65|%45)(c|%63|%43)(t|%74|%54)/ix"; string regexForInsert = @"/((%27)|')\s*(i|%69|%49)(n|%6E|%4E)(s|%73|%53)(e|%65|%45)(r|%72|%52)(t|%74|%54)/ix"; string regexForUpdate = @"/((%27)|')\s*(u|%75|%55)(p|%70|%50)(d|%64|%44)(a|%61|%41)(t|%74|%54)(e|%65|%45)/ix"; string regexForDelete = @"/((%27)|')\s*(d|%64|%44)(e|%65|%45)(l|%6C|%4C)(e|%65|%45)(t|%74|%54)(e|%65|%45)/ix"; string regexForDrop = @"/((%27)|')\s*(d|%64|%44)(r|%72|%52)(o|%6F|%4F)(p|%70|%50)/ix"; string regexForAlter = @"/((%27)|')\s*(a|%61|%41)(l|%6C|%4C)(t|%74|%54)(e|%65|%45)(r|%72|%52)/ix"; string regexForCreate = @"/((%27)|')\s*(c|%63|%43)(r|%72|%52)(e|%65|%45)(a|%61|%41)(t|%74|%54)(e|%65|%45)/ix"; </code></pre> <p>One other suggestion for the code in general: For each <code>if</code> statement I would suggest replacing <code>isInj = true;</code> with <code>return true;</code> so that you don't waste time doing unnecessary comparisons. In reality it probably won't make any performance difference but it could if you were calling that function really often.</p>
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    1. USlostriebo
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    1. COYour answer ir near the true. Seems my sql differs and regex class to. So i modified it to work, like this: string regexForUnion = @"^(\-\-)\s*(u|%75|%55)(n|%6E|%4E)(i|%69|%49)(o|%6F|%4F)(n|%6E|%4E)$";
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      1. USVytas999
 

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