PHP regex and repeated patterns

Question

I'd like to match these strings using preg_match, basicaly only repeated patterns of digits and a comma (optional), no letters

123
123,
123,456
123,456,
123,456,789
123,456,789,
etc...

but not

abc
123,abc
123,abc,456
abc,123,456

thanks

What do you mean exactly by "repeated pattern"? Show us other possible patterns. — Casimir et Hippolyte
– Casimir et Hippolyte, Commented Jul 24, 2015 at 14:07
the repeated pattern is \n+\,*. when there's a letter I need preg_match to return false — user3174311
– user3174311, Commented Jul 24, 2015 at 14:14
@stachu i think so to validate string ^([0-9]+)(?:,([0-9]+))*$ — splash58
– splash58, Commented Jul 24, 2015 at 14:16

Avinash Raj · Accepted Answer · 2015-07-24 14:22:00Z

2

Put comma and the pattern to match one or more digits inside a non-capturing group and then make it to repaet zero or more times. And also don't forget to add an optional comma at the last.

^[0-9]+(?:,[0-9]+)*,?$

DEMO

answered Jul 24, 2015 at 14:22

Avinash Raj

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