Regular Expressions 101

(?i)applies the following effective flags to the remainder of the pattern: gmi

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

^start of line

Non-Capturing Group(?:NPO|PRO|PCR|REQ|8)+

+repeats the group contents below at least once:

1st AlternativeNPO

NPOthe literal text NPO (case insensitive)

2nd AlternativePRO

PROthe literal text PRO (case insensitive)

3rd AlternativePCR

PCRthe literal text PCR (case insensitive)

4th AlternativeREQ

REQthe literal text REQ (case insensitive)

5th Alternative8

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

Group 1(\d{7,8})

\d{7,8}a Unicode decimal digit, repeated between 7 and 8 times

Negative Lookahead(?!(\d))

Group 2(\d)

\da Unicode decimal digit

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?i)^(?:NPO|PRO|PCR|REQ|8)+(\d{7,8})(?!(\d))

New

NPO1234567
NPO12345678
NPO123456
NPO123456789
npo1234567
npo12345678
npo123456
npo123456789
PRO1234567
PRO12345678
PRO123456
PRO123456789
pro1234567
pro12345678
pro123456
pro123456789
PCR1234567
PCR12345678
PCR123456
PCR123456789
pcr1234567
pcr12345678
pcr123456
pcr123456789
REQ1234567
REQ12345678
REQ123456
REQ123456789
req1234567
req12345678
req123456
req123456789
81234567
812345678
8123456
8123456789

Regular Expression

Substitution