Irule with regex to match /

Hi Amanpreet,

the best approach would be to avoid RegEx pattern as much as possible. RegEx has a very poor performance compared to -glob matchings and most patterns can be easily expressed using the -glob syntax.

Using -glob matching via if { [string match $x $y] }{script}

if { [string match "*/allow/*" [HTTP::path]] } then {
     Do what ever you want with the path containing "*/allow/*"
} else {
     Do what ever you want with the path not containing "*/allow/*"
}

Using -glob matching via switch -glob -- $x $y {script}

switch -glob -- [HTTP::path] "*/allow/*" {
     Do what ever you want with the path containing "*/allow/*"
} default {
     Do what ever you want with the path not containing "*/allow/*"
}

Well, if you still want to use -regex, then feel free to use one of the code samples below...

Using -regex matching via if { $x matches_regex $y }{script}

if { [HTTP::path] matches_regex ".*/allow/.*" } then {
     Do what ever you want with the path containing "*/allow/*"
} else {
     Do what ever you want with the path not containing "*/allow/*"
}

Using -regex matching via switch -regex - $x $y {script}

switch -regex -- [HTTP::path] ".*/allow/.*" {
     Do what ever you want with the path containing "*/allow/*"
} default {
     Do what ever you want with the path not containing "*/allow/*"
}

Recommended Read: iRules 101 - 10 - Regular Expressions: Think twice, no three times, about using Regular Expressions

https://devcentral.f5.com/articles/irules-101-10-regular-expressions

Note: If you need to filter out xyz//allow/ or /allow//xyz or even xyz//allow//xyz but not xyz/allow/xyz then you could use a syntax as outlined below...

if { ( [string match "*//allow/*" [HTTP::path]] ) or ( [string match "*/allow//*" [HTTP::path]] ) } then {
     Do what ever you want with the path containing "*//allow//*"
} else {
     Do what ever you want with the path not containing "*//allow//*"
}

... or using a RegEx version...

if { [HTTP::path] matches_regex {.*(//allow/|/allow//).*} } then {
     Do what ever you want with the path containing "*//allow//*"
} else {
     Do what ever you want with the path not containing "*//allow//*"  
}

Cheers, Kai