[groovy-user] Accessing a regex Pattern group from a switch/case

[Grey, Lee]

I'd like to do something like this:

def s = 'tracking_level_2'

switch(s) {
case ~/tracking_level_\d/:
assert '2' == ______
}

Is there anything that can fill in the blank above that gives me access to the digit at the end of the Pattern?

Thanks,
Lee Grey

[Jason Davis]

i do something similar by loading Patterns in a list then

patterns.find { it ==~ someStr }

Post by Grey, Lee
def s = 'tracking_level_2'
switch(s) {
  assert '2' == ______
}
Is there anything that can fill in the blank above that gives me access to
the digit at the end of the Pattern?
Thanks,
Lee Grey

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[Jason Davis]

and combine that with a strategy pattern

strats[starts.keySet.find { it ==~ someStr }]()

where starts is a map with the pattern as the keys and a default
closure for null

Post by Jason Davis
i do something similar by loading Patterns in a list then
patterns.find { it ==~ someStr }

Post by Grey, Lee
def s = 'tracking_level_2'
switch(s) {
  assert '2' == ______
}
Is there anything that can fill in the blank above that gives me access to
the digit at the end of the Pattern?
Thanks,
Lee Grey

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To unsubscribe from this list, please visit:

http://xircles.codehaus.org/manage_email

[Roshan Dawrani]

*def s = 'tracking_level_2'*
**
*switch(s) {
assert '2' == ______
}*
Is there anything that can fill in the blank above that gives me access to
the digit at the end of the Pattern?

See if it helps: "Getting handle to matcher inside switch
case"<http://groovyconsole.appspot.com/script/424001>

[Roshan Dawrani]

*def s = 'tracking_level_2'*
**
*switch(s) {
assert '2' == ______
}*
Is there anything that can fill in the blank above that gives me access to
the digit at the end of the Pattern?

Just turned it into a small post as well: "Groovy Tip: Accessing Pattern
Matcher instance Used in Switch Case
Statements"<http://roshandawrani.wordpress.com/2011/02/23/groovy-tip-accessing-matcher-used-in-pattern-matching-in-switch-case-statements/>
as
it may help someone later.

[Guillaume Laforge]

Using Matcher.lastMatcher might be a bit better.
It's a DGSM method added on matcher, so it's more "public" API compared to
using the org.codehaus.groovy.runtime class which is more "internal" API.

(I added a comment on the Groovy Web Console example)

Anyhow, that's a nice trick, and I didn't even remember about that
RegexSupport stuff!
Funny how I can still (re)discover certain nuggets like that after all this
time :-)

Guillaume

Post by Roshan Dawrani

*def s = 'tracking_level_2'*
**
*switch(s) {
assert '2' == ______
}*
Is there anything that can fill in the blank above that gives me access
to the digit at the end of the Pattern?

Just turned it into a small post as well: "Groovy Tip: Accessing Pattern
Matcher instance Used in Switch Case Statements"<http://roshandawrani.wordpress.com/2011/02/23/groovy-tip-accessing-matcher-used-in-pattern-matching-in-switch-case-statements/> as
it may help someone later.