M4 Regexp Examples
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| Regexp | Explanation |
| .* | everything |
| ^[0-9]+$ | only digits |
| ^\+?[0-9]+$ | + sign and only digits |
| ^370[0-9]+$ | only digits starting with 370 |
| ^370.*$ | anything starting with 370 |
| ^(37[0-1])|(44)[0-9]*$ | only digits starting with 370 or 371 or 44 |
