# Regular Expressions

-   \^ Start of the string
-   \$ End of the string
-   ? optional example 1? makes the 1 optional
-   \\d{10} 10 digits
-   ( and ) gets matching digits inside brackets sets a \$1 and second
    set of brackets creates \$2
-   \^\\+?1?(\\d{10})\$ 10 to 11 digits and e164 format sets \$1 to 10
    digits
-   \[0-9\] Any number between 0 to 9
-   \[2-9\] Any number between 2 to 9
-   \| The pipe works like an OR. Example \^101\$\|\^102\$ matches 101
    or 102
-   \^9(\\d{10})\$ This strips off the 9 and the \$1 value is the
    remaining 10 digits

**Dialplan Expression**

-   **Two digits:** \^(\\d{2})\$
-   **Three digits:** \^(\\d{3})\$
-   **Four digits:** \^(\\d{4})\$
-   **FIve digits:** \^(\\d{5})\$
-   **Six digits:** \^(\\d{6})\$
-   **Seven digits(Local Calling):** \^(\\d{7})\$
-   **Eight digits:** \^(\\d{8})\$
-   **Nine digits:** \^(\\d{9})\$
-   **Ten digits(Long Distance):** \^(\\d{10})\$
-   **Eleven digits(Long Distance with a 1):** \^\\+?(\\d{11})\$
-   **North America:** \^\\+?1?(\\d{10})\$
-   **North America International:** \^(011\\d{9,17})\$
-   **Caribbean:**
    \^(?:+1[\|1)((?:684\|](##SUBST##|1)((?:684|)264[\|268\|](##SUBST##|268|)242[\|246\|](##SUBST##|246|)441[\|284\|](##SUBST##|284|)345[\|767\|](##SUBST##|767|)809[\|829\|](##SUBST##|829|)849[\|473\|](##SUBST##|473|)876[\|664\|](##SUBST##|664|)670[\|787\|](##SUBST##|787|)939[\|869\|](##SUBST##|869|)758[\|784\|](##SUBST##|784|)721[\|868\|](##SUBST##|868|)649)\\d{7})\$
-   **Europe International:** \^(00\\d{9,17})\$
-   **International:** \^(\\d{12,20})\$
-   **311 Information:** \^(311)\$
-   **711 TTY:** \^(711)\$
-   **911 Emergency:** \^(911)\$
-   **Toll Free:**
    \^1?(8(00[\|55\|](##SUBST##|55|)66[\|77\|](##SUBST##|77|)88)\[2-9\]\\d{6})\$
-   **INUM:** \^0118835100\\d{8}\$
-   **Dial 9 then Two digits:** \^9(\\d{2})\$
-   **Dial 9 then Three digits:** \^9(\\d{3})\$
-   **Dial 9 then Four digits:** \^9(\\d{4})\$
-   **Dial 9 then Five digits:** \^9(\\d{5})\$
-   **Dial 9 then Six digits:** \^9(\\d{6})\$
-   **Dial 9 then Seven digits:** \^9(\\d{7})\$
-   **Dial 9 then Eight digits:** \^9(\\d{8})\$
-   **Dial 9 then Nine digits:** \^9(\\d{9})\$
-   **Dial 9 then Ten digits:** \^9(\\d{10})\$
-   **Dial 9 then Eleven digits:** \^9(\\d{11})\$
-   **Dial 9 then International:** \^9(\\d{12,20})\$

**Links**

-   <https://regex101.com/>
-   <https://regex101.com/r/QmOZiH/3/>
-   <https://regexr.com/>
-   <https://extendsclass.com/regex-tester.html>
-   <https://softwium.com/regex-explainer/>