When should I use MID instead of LEFT?

Use MID when the value you need starts in the middle and you know the start position and length (IDs with fixed segments).

Are TEXTSPLIT and TEXTBEFORE better than MID?

Yes in Microsoft 365 when a delimiter separates the parts. Use LEFT/MID/RIGHT for fixed-width codes.

Legacy: =LEFT(A1,FIND("-",A1)-1). Modern: =TEXTBEFORE(A1,"-").

LEFT / MID / RIGHT vs TEXTBEFORE / TEXTAFTER / TEXTSPLIT

Choose the right Excel text extraction function for codes, IDs, names, and imported values that need to be split by position.

Use LEFT, MID, and RIGHT for fixed-position extraction. Use TEXTBEFORE, TEXTAFTER, and TEXTSPLIT in modern Excel when values are separated by a delimiter.

LEFT returns characters from the start of a text string.
RIGHT returns characters from the end of a text string.
MID returns characters from the middle when you know the start position and length.

TEXTBEFORE and TEXTAFTER are easier when a delimiter separates the value you need.
TEXTSPLIT is better when one cell should become multiple columns or rows.

When should I use MID instead of LEFT? Use MID when the value you need starts in the middle and you know the start position and length (IDs with fixed segments).
Are TEXTSPLIT and TEXTBEFORE better than MID? Yes in Microsoft 365 when a delimiter separates the parts. Use LEFT/MID/RIGHT for fixed-width codes.
How do I extract before a hyphen? Legacy: =LEFT(A1,FIND("-",A1)-1). Modern: =TEXTBEFORE(A1,"-").

LEFT: extract characters from the start — area codes, prefixes, leading SKU segments.
RIGHT: extract from the end — extensions, suffixes, last N digits of an ID.
MID: extract from a known position — fixed-width files where code length varies by segment.
Pair all three with FIND or SEARCH when delimiter positions are variable instead of fixed width.

TRIM and CLEAN invisible characters that shift MID start positions.
Convert exported CSV numbers stored as text before combining parsed segments back into IDs.
Consider Flash Fill or Power Query when patterns are irregular — formulas alone may not scale.

Build both formulas side-by-side on a sample Table and compare results row by row.
Document which version each stakeholder uses before standardizing on the newer function.
Keep a migration log when replacing legacy formulas — note old and new syntax per column.

Verdict summary: Use LEFT, MID, and RIGHT for fixed-position extraction. Use TEXTBEFORE, TEXTAFTER, and TEXTSPLIT in modern Excel when values are separated by a delimiter.
Recreate both formulas on ten sample rows and compare with EXACT or subtraction helper columns.
List which teammates still run Excel 2019 or Excel for the web before mandating the newer option.
Document migration date and owner when replacing legacy syntax in shared production models.
Related functions to review next: LEFT, MID, RIGHT, FIND, TEXTBEFORE, TEXTAFTER.
Keep legacy blocks stable during pilot — migrate one column or report section at a time until totals reconcile.

Publish the verdict internally: Use LEFT, MID, and RIGHT for fixed-position extraction. Use TEXTBEFORE, TEXTAFTER, and TEXTSPLIT in modern Excel when values are separated by a delimiter.
Pilot on a copy of the production sheet with ten known test keys before mass migration.
Train Excel 2019 users on the legacy option until IT confirms Microsoft 365 desktop for all editors.
Add a changelog column documenting which rows still use the older function after partial migration.
Link new hires to both function pages and this comparison from your team wiki or onboarding doc.
Re-run reconciliation monthly for one quarter after rollout to catch edge cases early.