Regular Expressions 101

Group 1(Order[0-9])

Orderthe literal text Order (case sensitive)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Negative Lookahead(?!.*\1)

.*any character (except for line terminators), repeated any number of times

\1the text saved by group 1

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(Order[0-9])(?!.*\1)

New

<ctx>
  <PostCode>XXXXXX</PostCode>
  <Title1>Mr</Title1>
  <Name>John</Name>
  <Order1>£100.00</Order1>
  <Order2>£100.01</Order2>
  <Order3>£100.01</Order3>
  <Order4>£100.01</Order4>
  <Order5>£100.01</Order5>
  <Order6>£100.01</Order6>
  <Order7>£100.01</Order7>
  <Order8>£100.01</Order8>
  <Order9>£100.01</Order9>
  <Order10>£100.01</Order10>
  <Order11>£100.01</Order11>
  <Order50>£100.01</Order50>
  <Date>10/10/2010</Date>
</ctx>