regex101: .NET 10.0 (C#) Match Workspace

Pro

Positive Lookbehind(?<= (?:55|270|271)=)

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:55|270|271)

1st Alternative55

55the literal text 55

2nd Alternative270

270the literal text 270

3rd Alternative271

271the literal text 271

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negated Character Class[^ ]+

+matches at least one character outside the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

Global pattern flags

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

25 tokens

Regular Expression

(?<= (?:55|270|271)=)[^ ]+

New

20220606-21:10:21.930 : 8=FIX.4.49=209 35=W34=35 49=FIXDIRECT.FT 52=20220606-21:10:21.925 56=MM_EUR_FIX_QS 55=US30 262=96 268=2 269=0 270=32921.6 271=2000000 299=16ynjsz-16ynjsz5qCaA 269=1 270=32931.4 271=2000000 299=16ynjsz-16ynjsz5qCaA 10=048

Extraction

20220606-21:10:21.930 : 8=FIX.4.49=209 35=W34=35 49=FIXDIRECT.FT 52=20220606-21:10:21.925 56=MM_EUR_FIX_QS 55=US30 262=96 268=2 269=0 270=32921.6 271=2000000 299=16ynjsz-16ynjsz5qCaA 269=1 270=32931.4 271=2000000 299=16ynjsz-16ynjsz5qCaA 10=048