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This regular expression is build from the description of NINO number of GOV.UK,

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/[0-9]{2}(\.|\s)?[0-9]{3}(\.|\s)?[0-9]{2}\n/gm

Basic RegEx to catch ITU E.164 Formatted Telephone Numbers. Must include leading '+', first digit cannot be a zero, no other non-numeric characters -- with (optional) exception of Extensions denoted by ";ext=" and between 3 and 6 digits in the extension (adjust max to suit organization)

ผลิตภัณฑ์ส่งเสริมการขาย

8k realese

Port https://regex101.com/library/cX0pJ8 to PCRE2 (PHP >= 7.3)

a word is anything valid within a parens (like in a function), but the function itself should not be matched a word may have a numeric at the end or the start there is no guarantee of a single space (or ANY space other than some operators)

frac

remove currency symbol, remove commas

haowei.ch

smargs not margins

csc

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Ejemplo del uso de grupos lookahead

Best I could do for parsing dates spelled out as day, month name, year

Check Integer Number