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2024-08-30 16:41:01 +02:00
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07_String_Processing.md
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@@ -38,7 +38,7 @@
- [Searching Using Regular Expressions](#searching-using-regular-expressions)
- [System Classes for Regular Expressions](#system-classes-for-regular-expressions)
- [Replacing Using Regular Expressions](#replacing-using-regular-expressions)
- [Misc Examples Using Regular Expressions](#misc-examples-using-regular-expressions)
- [Overview/Examples: Using PCRE Regular Expressions in Various Contexts](#overviewexamples-using-pcre-regular-expressions-in-various-contexts)
- [More String Functions](#more-string-functions)
- [Checking the Similarity of Strings](#checking-the-similarity-of-strings)
- [Repeating Strings](#repeating-strings)
@@ -1743,6 +1743,9 @@ Anchors and Positions
| `\b` | Start or end of word | 1. `\ba.` <br>2. `\Dd\b` <br>3. `\b.d\b` | abcd a12d ed | 1. <ins>**ab**</ins>cd <ins>**a1**</ins>2d ed <br>2. ab<ins>**cd**</ins> a12d <ins>**ed**</ins> <br> 3. abcd a12d <ins>**ed**</ins> | 1. ab<ins>**cd**</ins> a1<ins>**2d**</ins> ed <br> 2. abcd a1<ins>**2d**</ins> ed <br> 3. <ins>**abcd**</ins> <ins>**a12d**</ins> ed |
| `\B` | Negation of `\b`, not at the start or end of words | `\Be\B` | see an elefant | s<ins>**e**</ins>e an el<ins>**e**</ins>fant | s<ins>**ee**</ins> an <ins>**e**</ins>lefant |
> **💡 Note**<br>
> Find more information [here](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenregex_pcre_syntax_specials.htm). Note that there are further anchors available such as `\A` and `\Z` for the start and end of strings.
<p align="right"><a href="#top">⬆️ back to top</a></p>
#### Searching Using Regular Expressions
@@ -1937,12 +1940,83 @@ REPLACE ALL OCCURRENCES OF PCRE `p.` IN s1 WITH `XY` "XY?aXY#ab?a
<p align="right"><a href="#top">⬆️ back to top</a></p>
#### Misc Examples Using Regular Expressions
#### Overview/Examples: Using PCRE Regular Expressions in Various Contexts
This section demonstrates various examples using regular expressions. For example, it includes the handling of special characters.
Regarding special characters, check the [Special Characters](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenregex_pcre_syntax_specials.htm) topic in the ABAP Keyword Documentation.
- As also covered in other sections, there are multiple contexts where regular expressions (PCRE) are possible, among them:
- Statements (`PCRE` addition): `FIND`, `REPLACE`
- Classes: `CL_ABAP_REGEX`, `CL_ABAP_MATCHER`
- Built-in functions having the `pcre` parameter: `find`, `find_end`, `count`, `match`, `replace`, `substring_from`, `substring_after`, `substring_before`, `substring_to`
- Note: Built-in string functions dealing with regular expressions are also available for ABAP SQL and CDS. See the [Misc Built-In Functions](24_Misc_Builtin_Functions.md) cheat sheet.
Examples:
```abap
DATA(some_string) = `aa bb cc dd ee`.
DATA(original_string) = some_string.
"---------------- Statements ----------------
FIND ALL OCCURRENCES OF PCRE `\s` IN some_string RESULTS DATA(findings).
*LINE OFFSET LENGTH SUBMATCHES
*0 2 1 OFFSET LENGTH
*
*0 5 1 OFFSET LENGTH
*
*0 8 1 OFFSET LENGTH
*
*0 11 1 OFFSET LENGTH
*
"aa#bb#cc#dd#ee
REPLACE ALL OCCURRENCES OF PCRE `\s` IN some_string WITH `#`.
some_string = original_string.
"---------------- Classes ----------------
"The result is the same as 'findings'
DATA(regex_cl1) = cl_abap_regex=>create_pcre( pattern = `\s` )->create_matcher( text = some_string )->find_all( ).
"---------------- Built-in Functions ----------------
"2
DATA(find_first_occ) = find( val = some_string pcre = `\s` ).
"8
DATA(find_third_occ) = find( val = some_string pcre = `\s` occ = 3 ).
"3
DATA(find_end_first_occ) = find_end( val = some_string pcre = `\s` ).
"4
DATA(count) = count( val = some_string pcre = `\s` ).
"aa b
DATA(match) = match( val = some_string
pcre = `a.\s.` ).
"aa#bb cc dd ee
DATA(replace_first_occ) = replace( val = some_string pcre = `\s` with = `#` ).
some_string = original_string.
"aa#bb#cc#dd#ee
DATA(replace_all_occ) = replace( val = some_string pcre = `\s` with = `#` occ = 0 ).
"The following examples always use the first occurrence
"' bb cc dd ee'
DATA(substr_from) = substring_from( val = some_string pcre = `\s` ).
"'aa '
DATA(substr_to) = substring_to( val = some_string pcre = `\s` ).
"'aa'
DATA(substr_before) = substring_before( val = some_string pcre = `\s` ).
"bb cc dd ee
DATA(substr_after) = substring_after( val = some_string pcre = `\s` ).
******************************************************************************
"The following snippets demonstrates more examples using regular expressions
"String created with string template and control characters for
"new line, tab, and return
DATA(a) = |A B\nC\tD\rE|.
@@ -1988,7 +2062,7 @@ ASSERT sy-subrc = 4.
DATA(html_a) = |<p>Hallo\n</p><p>Ciao!</p><p>Salut.</p>|.
DATA(html_b) = html_a.
REPLACE ALL OCCURRENCES OF PCRE `(<p>)(.*?)(<\/p>)` IN html_a WITH `$1Hi$3`.
REPLACE ALL OCCURRENCES OF PCRE `(<p>)(.*?)(<\/p>)` IN html_a WITH `$1Hi$3`.
*<p>Hallo
*</p><p>Hi</p><p>Hi</p>