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How to Use Regular Expressions

matches a single backslash (\)

matches the beginning of a word (e.g.: \bex matches "example" but not "text")

\n, \r, \t, \v

match whitespace characters

\', \"

match single and double quotes

Matching in Regular Expressions

If a real expression could match more than one substring of a given string, the real expression matches the one

starting earliest in the string. If the real expression could match more than one substring starting at that point, it

matches the longest. Subexpressions also match the longest possible substrings, subject to the constraint that

the whole match be as long as possible, with subexpressions starting earlier in the real expression taking priority

over ones starting later. Note that higher-level subexpressions thus take priority over their lower-level component

subexpressions.

Match lengths are measured in characters, not collating elements. A null string is considered longer than no match

at all. For example, 'bb*' matches the three middle characters of 'abbbc', '(wee|week)(knights|nights)' matches all

ten characters of 'weeknights', when '(.*).*' is matched against 'abc' the parenthesized subexpression matches all

three characters, and when '(a*)*' is matched against 'bc' both the whole real expression and the parenthesized

subexpression match the null string.

Using Regular Expressions in Match Rules

TBD

Using Regular Expressions in Responders

In some cases, it may be desirable to examine the URL of an incoming request and re-use parts of it in the URL

returned to the client by a Redirect Responder. This is the purpose of the regex parameter: specify a custom

regular expression that is used to:

l Parse the URL of an incoming request

l Break it down into separate strings (based on the positions of literal characters in the expression)

l Assign each string to a named variable

These named variables can then be used in the URL field of the Redirect Responder. When the Responder replies

to a client, it performs string substitution on the URL. Because the purpose of using regular expressions to perform

string substitution in Redirect URLs is to parse request URLs into strings, constructing an appropriate regular

expression requires an exact knowledge of the format of the request URLs that will typically be coming in to the

cluster IP.

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