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If phone number is 02871 2397567 and we like to let pass only last 3 digit (567) we have to “cut” 02871 2397.

There are sever way severl ways how can number come in, that way we have to check all possibility’s.

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			Prefix		City prefix		Number			Comment
			0049		2871		2397		567 567
			+49		2871		2397	567	567
			49		2871		2397	567	567
			0		2871		2397	567	567
					2871		2397		567
							2397	567	567
		(?:	0049\|\+49\|49\|0	)?						Will be checkt if 0049 or +49 or 49 or 0 is part of incomming number. If yes, this part will be cut.
	(?:				2871	)?				Will be checkt if 2871 is part of incomming number. If yes, this part will be cut.
^(?:							2397	)?		Will be checkt if 2397 is part of incomming number. If yes, this part will be cut.
									(.*)	All number those are still there will be saved in $1
^(?:	(?:	(?:	0049\|\+49\|49\|0	)?	2871	)?	2397	)?	(.*)	Expression.

(?: ( ?: (?: 0049|\+49|49|0)?2871)? 2397 )?(.*) In $1 will be saved 567.

If we what to use complete number 2397567 in “Inbound routes” that should look like this:

		Prefix		City prefix		Number	Comment
		0049		2871	2397567	2397567
		+49		2871	2397567	2397567
		49		2871	2397567	2397567
		0		2871	2397567	2397567
				2871	2397567	2397567
					2397567	2397567
	(?:	0049\|\+49\|49\|0	)?				Will be checkt if 0049 or +49 or 49 or 0 is part of incomming number. If yes, this part will be cut.
^(?:				2871	)?		Will be checkt if 2871 is part of incomming number. If yes, this part will be cut.
						(.*)	All number those are still there will be saved in $1
^(?:	(?:	0049\|\+49\|49\|0	)?	2871	)?	(.*)	Expression.

( ?: (?: 0049|\+49|49|0)?2871)?(.*) In $1 will be saved 2397567saved 2397567.

Explanation:

(.*) – all numbers which still are there

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(?:XXXXX)? – means if XXXXX exist this part will be “cut”.

| – ist is "or"

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