1.the string can be of lenght 3 or 4 2.the string should start with a alphabet 3.the string should contain atleast one alphabet and number.

If given a linux file path match the filename without the extension. It extracts FileNameWithoutExtension into its own match group so that you can use it in things like Logstash Grok.

09-10-2015_17:12:59.536_PDT] [ERROR] - [FxG5vfvSFN] [family.gibson@att.net@slid.dum] [] [common] [AbstractServiceLayerBridge] - Service Exception while invoking [ServiceLayer API]: UsageService.getFiberUsageDetails with [TransactionId]: COLDAPP_WS_380920115_144187749927000022_p9mbm20_0 java.lang.ref...

this regular expression allow numbers with one number from 1 to 5 and only one decimal value Onlys accept numeric values from 1.0 to 5

When using javascript to get a cookie value by its name, Get the cookie string by document.cookie Use this pattern to get the proper value. Just replace the cookie name in my pattern. Use 1st or 2nd group(this is only used when your cookie name is last in the string)

Pattern that check your string to match Google Plus user profile URL.

Pattern that check your string to match Twitter user profile URL.

Pattern that check your string to match Facebook user profile URL.

Selects Xml version and Encoding and whitespaces

Password pattern looking for strength. Between 8 and 16 characters. At least: 1 UpperCase. 1 LowerCase. 1 SpecialCase. 1 Number

Checks whether given text is valid Email Id,check for top level domains which are 2-3 in length,does not accept numbers for top level domains

Matches HTML structure

from 0.0.0.0 to 255.255.255.255

regex to allow unicode chars & digits in config values

This validates version numbers that adhear to the Semantic protocol e.g. in form of xx.xx.xx or 1.2.2