Regular Expression Samples - .Net Framework

Examples¶

To use regular expressions, be sure to include using System.Text.RegularExpressions; in your file header.
Regular expressions with a Passed note in the SDL column have successfully passed testing in the SDL Regex Fuzzer (available here) when run for All ASCII Characters and 500 iterations.

Item	Template	SDL	Regular Expression
Date	MM/DD/YYYY		`^(\d{2}/\d{2}/\d{4})?$`
Time	h:mmtt¹		`^(1[0-2]\|\d)\:\d{2}\s{0,}[APap][Mm]$`
Phone Number	xxx-xxx-xxxx	Passed	`^[2-9]\d{2}\-\d{3}\-\d{4}$`
Phone Number	xxx-xxx-xxxx OR (xxx) xxx-xxxx		`^([2-9]\d{2}\-\|$[2-9]\d{2}$)\d{3}\-\d{4}`
Email Address		Passed	`^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$`
Guid	hhhhhhhh-hhhh-hhhh-hhhh-hhhhhhhhhhhh		`^\{{0,1}[A-Fa-f0-9]{8}\-[A-Fa-f0-9]{4}\-[A-Fa-f0-9]{4}\-[A-Fa-f0-9]{4}\-[A-Fa-f0-9]{12}\}{0,1}$`
Object Method			`var.([A-Za-z0-9]*)[^A-Za-z0-9]`
8.3 File Name, strict²			`^[A-Za-z][A-Za-z0-9_]{0,7}\.[A-Za-z0-9_]{0,3}$`
8.3 File name, lenient²			`^[A-Za-z][^ \"<>\|:?\\/]{0,7}\.[^ \"<>\|:?\\/]{0,3}$`
URL			`^(?#Protocol)(?:(?:ht\|f)tp(?:s?)\:\/\/\|~/\|/)?(?#Username:Password)(?:\w+:\w+@)?(?#Subdomains)(?:(?:[-\w]+\.)+(?#TopLevel Domains)(?:com\|org\|net\|gov\|mil\|biz\|info\|mobi\|name\|aero\|jobs\|museum\|travel\|[a-z]{2}))(?#Port)(?::[\d]{1,5})?(?#Directories)(?:(?:(?:/(?:[-\w~!$+\|.,=]\|%[a-f\d]{2})+)+\|/)+\|\?\|#)?(?#Query)(?:(?:\?(?:[-\w~!$+\|.,:]\|%[a-f\d{2}])+=(?:[-\w~!$+\|.,:=]\|%[a-f\d]{2}))(?:&(?:[-\w~!$+\|.,:]\|%[a-f\d{2}])+=(?:[-\w~!$+\|.,:=]\|%[a-f\d]{2})))(?#Anchor)(?:#(?:[-\w~!$+\|.,:=]\|%[a-f\d]{2}))?$`

¹ - Validates hour is between 1 and 12; can have space before meridian indicator (am/pm).
² - 8.3 file name, strict = Allowing first char alpha, the rest alphanumeric (or underscore)

Using Back References¶

Regex r = new RegEx("Cells\(([A-Za-z]*))");
MatchCollection mc = r.Matches("Cells(uxIdColumn)")
string result = mc[0].Groups[1].Value
// result now = "uxIdColumn"

Finding an Exact Match¶

//Note: MUST wrap the regular expression in parentheses (i.e., use groups)
regex.Matches(testString).Item(0).Groups(1).Value = testString ?